diff --git a/src/CommunityToolkit.Maui.Core/Extensions/ColorConversionExtensions.shared.cs b/src/CommunityToolkit.Maui.Core/Extensions/ColorConversionExtensions.shared.cs
index 7005dab0bf..80bbf975ef 100644
--- a/src/CommunityToolkit.Maui.Core/Extensions/ColorConversionExtensions.shared.cs
+++ b/src/CommunityToolkit.Maui.Core/Extensions/ColorConversionExtensions.shared.cs
@@ -1,4 +1,5 @@
-using System.Globalization;
+using System.ComponentModel;
+using System.Globalization;
 
 namespace CommunityToolkit.Maui.Core.Extensions;
 
@@ -19,7 +20,7 @@ public static class ColorConversionExtensions
 	public static string ToRgbString(this Color color)
 	{
 		ArgumentNullException.ThrowIfNull(color);
-		return $"RGB({color.GetByteRed()},{color.GetByteGreen()},{color.GetByteBlue()})";
+		return FormattableString.Invariant($"RGB({color.GetByteRed()},{color.GetByteGreen()},{color.GetByteBlue()})");
 	}
 
 	/// <summary>
@@ -32,10 +33,24 @@ public static string ToRgbString(this Color color)
 	/// and <b>alpha</b> is a value between 0 and 1. (e.g. <c>RGBA(255,0,0,1)</c> for <see cref="Colors.Red"/>).
 	/// </returns>
 	/// <exception cref="ArgumentNullException">Thrown when <paramref name="color"/> is null.</exception>
-	public static string ToRgbaString(this Color color, CultureInfo? cultureInfo = null)
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	[Obsolete("Do not use CultureInfo, this method should be culture invariant.")]
+	public static string ToRgbaString(this Color color, CultureInfo? cultureInfo) => ToRgbaString(color);
+
+
+	/// <summary>
+	/// Converts this <see cref="Color"/> to a <see cref="string"/> containing the red, green, blue and alpha components.
+	/// </summary>
+	/// <param name="color">The <see cref="Color"/> to convert.</param>
+	/// <returns>
+	/// A <see cref="string"/> in the format: <c>RGBA(red,green,blue,alpha)</c> where <b>red</b>, <b>green</b> and <b>blue</b> will be a value between 0 and 255,
+	/// and <b>alpha</b> is a value between 0 and 1. (e.g. <c>RGBA(255,0,0,1)</c> for <see cref="Colors.Red"/>).
+	/// </returns>
+	/// <exception cref="ArgumentNullException">Thrown when <paramref name="color"/> is null.</exception>
+	public static string ToRgbaString(this Color color)
 	{
 		ArgumentNullException.ThrowIfNull(color);
-		return $"RGBA({color.GetByteRed()},{color.GetByteGreen()},{color.GetByteBlue()},{color.Alpha.ToString(cultureInfo)})";
+		return FormattableString.Invariant($"RGBA({color.GetByteRed()},{color.GetByteGreen()},{color.GetByteBlue()},{color.Alpha})");
 	}
 
 	/// <summary>
@@ -50,7 +65,7 @@ public static string ToRgbaString(this Color color, CultureInfo? cultureInfo = n
 	public static string ToCmykString(this Color color)
 	{
 		ArgumentNullException.ThrowIfNull(color);
-		return $"CMYK({color.GetPercentCyan():P0},{color.GetPercentMagenta():P0},{color.GetPercentYellow():P0},{color.GetPercentBlackKey():P0})";
+		return FormattableString.Invariant($"CMYK({color.GetPercentCyan():0%},{color.GetPercentMagenta():0%},{color.GetPercentYellow():0%},{color.GetPercentBlackKey():0%})");
 	}
 
 	/// <summary>
@@ -63,10 +78,24 @@ public static string ToCmykString(this Color color)
 	/// 0% and 100% and <b>alpha</b> will be a value between 0 and 1. (e.g. <c>CMYKA(100%,100%,0%,100%,1)</c> for <see cref="Colors.Red"/>).
 	/// </returns>
 	/// <exception cref="ArgumentNullException">Thrown when <paramref name="color"/> is null.</exception>
-	public static string ToCmykaString(this Color color, CultureInfo? cultureInfo = null)
+
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	[Obsolete("Do not use CultureInfo, this method should be culture invariant.")]
+	public static string ToCmykaString(this Color color, CultureInfo? cultureInfo) => ToCmykaString(color);
+
+	/// <summary>
+	/// Converts this <see cref="Color"/> to a <see cref="string"/> containing the cyan, magenta, yellow, key and alpha components.
+	/// </summary>
+	/// <param name="color">The <see cref="Color"/> to convert.</param>
+	/// <returns>
+	/// A <see cref="string"/> in the format: <c>CMYKA(cyan,magenta,yellow,key,alpha)</c> where <b>cyan</b>, <b>magenta</b>, <b>yellow </b>and <b>key</b> will be a value between
+	/// 0% and 100% and <b>alpha</b> will be a value between 0 and 1. (e.g. <c>CMYKA(100%,100%,0%,100%,1)</c> for <see cref="Colors.Red"/>).
+	/// </returns>
+	/// <exception cref="ArgumentNullException">Thrown when <paramref name="color"/> is null.</exception>
+	public static string ToCmykaString(this Color color)
 	{
 		ArgumentNullException.ThrowIfNull(color);
-		return $"CMYKA({color.GetPercentCyan():P0},{color.GetPercentMagenta():P0},{color.GetPercentYellow():P0},{color.GetPercentBlackKey():P0},{color.Alpha.ToString(cultureInfo)})";
+		return FormattableString.Invariant($"CMYKA({color.GetPercentCyan():0%},{color.GetPercentMagenta():0%},{color.GetPercentYellow():0%},{color.GetPercentBlackKey():0%},{color.Alpha})");
 	}
 
 	/// <summary>
@@ -81,7 +110,7 @@ public static string ToCmykaString(this Color color, CultureInfo? cultureInfo =
 	public static string ToHslString(this Color color)
 	{
 		ArgumentNullException.ThrowIfNull(color);
-		return $"HSL({color.GetDegreeHue():0},{color.GetSaturation():P0},{color.GetLuminosity():P0})";
+		return FormattableString.Invariant($"HSL({color.GetDegreeHue():0},{color.GetSaturation():0%},{color.GetLuminosity():0%})");
 	}
 
 	/// <summary>
@@ -94,10 +123,23 @@ public static string ToHslString(this Color color)
 	/// will be a value between 0% and 100%, and <b>alpha</b> will be a value between 0 and 1. (e.g. <c>HSLA(0,100%,50%,1)</c> for <see cref="Colors.Red"/>).
 	/// </returns>
 	/// <exception cref="ArgumentNullException">Thrown when <paramref name="color"/> is null.</exception>
-	public static string ToHslaString(this Color color, CultureInfo? cultureInfo = null)
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	[Obsolete("Do not use CultureInfo, this method should be culture invariant.")]
+	public static string ToHslaString(this Color color, CultureInfo? cultureInfo) => ToHslaString(color);
+
+	/// <summary>
+	/// Converts this <see cref="Color"/> to a <see cref="string"/> containing the hue, saturation, lightness and alpha components.
+	/// </summary>
+	/// <param name="color">The <see cref="Color"/> to convert.</param>
+	/// <returns>
+	/// A <see cref="string"/> in the format: <c>HSLA(hue,saturation,lightness,alpha)</c> where <b>hue</b> will be a value between 0 and 360, <b>saturation</b> and <b>lightness</b>
+	/// will be a value between 0% and 100%, and <b>alpha</b> will be a value between 0 and 1. (e.g. <c>HSLA(0,100%,50%,1)</c> for <see cref="Colors.Red"/>).
+	/// </returns>
+	/// <exception cref="ArgumentNullException">Thrown when <paramref name="color"/> is null.</exception>
+	public static string ToHslaString(this Color color)
 	{
 		ArgumentNullException.ThrowIfNull(color);
-		return $"HSLA({color.GetDegreeHue():0},{color.GetSaturation():P0},{color.GetLuminosity():P0},{color.Alpha.ToString(cultureInfo)})";
+		return FormattableString.Invariant($"HSLA({color.GetDegreeHue():0},{color.GetSaturation():0%},{color.GetLuminosity():0%},{color.Alpha})");
 	}
 
 	/// <summary>
diff --git a/src/CommunityToolkit.Maui.UnitTests/Behaviors/ValidationBehaviorTests.cs b/src/CommunityToolkit.Maui.UnitTests/Behaviors/ValidationBehaviorTests.cs
index 834e3dbb1a..0882e97780 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Behaviors/ValidationBehaviorTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Behaviors/ValidationBehaviorTests.cs
@@ -1,4 +1,5 @@
-using CommunityToolkit.Maui.Behaviors;
+using System.Threading.Tasks;
+using CommunityToolkit.Maui.Behaviors;
 using CommunityToolkit.Maui.UnitTests.Mocks;
 using Xunit;
 using Xunit.v3;
@@ -8,7 +9,7 @@ namespace CommunityToolkit.Maui.UnitTests.Behaviors;
 public class ValidationBehaviorTests(ITestOutputHelper testOutputHelper) : BaseBehaviorTest<ValidationBehavior, VisualElement>(new MockValidationBehavior(), new View())
 {
 	[Fact]
-	public void ValidateOnValueChanged()
+	public async Task ValidateOnValueChanged()
 	{
 		// Arrange
 		var entry = new Entry
@@ -18,6 +19,7 @@ public void ValidateOnValueChanged()
 		var behavior = new MockValidationBehavior()
 		{
 			ExpectedValue = "321",
+			SimulateValidationDelay = false,
 			Flags = ValidationFlags.ValidateOnValueChanged
 		};
 
@@ -26,6 +28,9 @@ public void ValidateOnValueChanged()
 		// Act
 		entry.Text = "321";
 
+		// Fails sometimes randomly without delay
+		await Task.Delay(10, TestContext.Current.CancellationToken);
+
 		// Assert
 		Assert.True(behavior.IsValid);
 	}
diff --git a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykStringConverterTests.cs b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykStringConverterTests.cs
index 0e42a110db..7d0e58295d 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykStringConverterTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykStringConverterTests.cs
@@ -135,15 +135,15 @@ public class ColorToCmykStringConverterTests : BaseOneWayConverterTest<ColorToCm
 		},
 	};
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ValidInputData))]
 	public void ColorToCmykStringConverterValidInputTest(float red, float green, float blue, float alpha, string expectedResult)
 	{
 		var converter = new ColorToCmykStringConverter();
 		var color = new Color(red, green, blue, alpha);
 
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, null);
-		var resultConvertFrom = converter.ConvertFrom(color);
+		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, Thread.CurrentThread.CurrentCulture);
+		var resultConvertFrom = converter.ConvertFrom(color, Thread.CurrentThread.CurrentCulture);
 
 		Assert.Equal(expectedResult, resultConvert);
 		Assert.Equal(expectedResult, resultConvertFrom);
diff --git a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykaStringConverterTests.cs b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykaStringConverterTests.cs
index bb710be9b5..ea7f37db88 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykaStringConverterTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToCmykaStringConverterTests.cs
@@ -1,4 +1,5 @@
-using CommunityToolkit.Maui.Converters;
+using System.Runtime.CompilerServices;
+using CommunityToolkit.Maui.Converters;
 using Xunit;
 
 namespace CommunityToolkit.Maui.UnitTests.Converters;
@@ -135,29 +136,15 @@ public class ColorToCmykaStringConverterTests : BaseOneWayConverterTest<ColorToC
 		},
 	};
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ValidInputData))]
 	public void ColorToCmykaStringConverterValidInputTest(float red, float green, float blue, float alpha, string expectedResult)
 	{
 		var converter = new ColorToCmykaStringConverter();
 		var color = new Color(red, green, blue, alpha);
 
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, new System.Globalization.CultureInfo("en-US"));
-		var resultConvertFrom = converter.ConvertFrom(color, new System.Globalization.CultureInfo("en-US"));
-
-		Assert.Equal(expectedResult, resultConvert);
-		Assert.Equal(expectedResult, resultConvertFrom);
-	}
-
-	[Fact]
-	public void ColorToRgbStringConverterCultureTest()
-	{
-		var expectedResult = "CMYKA(0%,0%,0%,100%,0,5)";
-		var converter = new ColorToCmykaStringConverter();
-		var color = new Color(0, 0, 0, 0.5f);
-
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, new System.Globalization.CultureInfo("uk-UA"));
-		var resultConvertFrom = converter.ConvertFrom(color, new System.Globalization.CultureInfo("uk-UA"));
+		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, Thread.CurrentThread.CurrentCulture);
+		var resultConvertFrom = converter.ConvertFrom(color, Thread.CurrentThread.CurrentCulture);
 
 		Assert.Equal(expectedResult, resultConvert);
 		Assert.Equal(expectedResult, resultConvertFrom);
diff --git a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslStringConverterTests.cs b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslStringConverterTests.cs
index b019baa1c2..569b39a4c6 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslStringConverterTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslStringConverterTests.cs
@@ -108,22 +108,22 @@ public class ColorToHslStringConverterTests : BaseOneWayConverterTest<ColorToHsl
 			0.25f, 0.25f, 0.25f, 0, "HSL(0,0%,25%)"
 		},
 		{
-			0.25f, 0.25f, 1, 1, "HSL(240,100%,62%)"
+			0.25f, 0.25f, 1, 1, "HSL(240,100%,63%)"
 		},
 		{
-			0.25f, 0.25f, 1, 0, "HSL(240,100%,62%)"
+			0.25f, 0.25f, 1, 0, "HSL(240,100%,63%)"
 		},
 		{
-			0.25f, 1, 0.25f, 1, "HSL(120,100%,62%)"
+			0.25f, 1, 0.25f, 1, "HSL(120,100%,63%)"
 		},
 		{
-			0.25f, 1, 0.25f, 0, "HSL(120,100%,62%)"
+			0.25f, 1, 0.25f, 0, "HSL(120,100%,63%)"
 		},
 		{
-			0.75f, 1, 0.25f, 1, "HSL(80,100%,62%)"
+			0.75f, 1, 0.25f, 1, "HSL(80,100%,63%)"
 		},
 		{
-			0.75f, 1, 0.25f, 0, "HSL(80,100%,62%)"
+			0.75f, 1, 0.25f, 0, "HSL(80,100%,63%)"
 		},
 		{
 			0.75f, 0, 1, 1, "HSL(285,100%,50%)"
@@ -133,15 +133,15 @@ public class ColorToHslStringConverterTests : BaseOneWayConverterTest<ColorToHsl
 		},
 	};
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ValidInputData))]
 	public void ColorToHslStringConverterValidInputTest(float red, float green, float blue, float alpha, string expectedResult)
 	{
 		var converter = new ColorToHslStringConverter();
 		var color = new Color(red, green, blue, alpha);
 
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, null);
-		var resultConvertFrom = converter.ConvertFrom(color);
+		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, Thread.CurrentThread.CurrentCulture);
+		var resultConvertFrom = converter.ConvertFrom(color, Thread.CurrentThread.CurrentCulture);
 
 		Assert.Equal(expectedResult, resultConvert);
 		Assert.Equal(expectedResult, resultConvertFrom);
diff --git a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslaStringConverterTests.cs b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslaStringConverterTests.cs
index 552ce2d8ba..26e372b96c 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslaStringConverterTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToHslaStringConverterTests.cs
@@ -107,22 +107,22 @@ public class ColorToHslaStringConverterTests : BaseOneWayConverterTest<ColorToHs
 			0.25f, 0.25f, 0.25f, 0, "HSLA(0,0%,25%,0)"
 		},
 		{
-			0.25f, 0.25f, 1, 1, "HSLA(240,100%,62%,1)"
+			0.25f, 0.25f, 1, 1, "HSLA(240,100%,63%,1)"
 		},
 		{
-			0.25f, 0.25f, 1, 0, "HSLA(240,100%,62%,0)"
+			0.25f, 0.25f, 1, 0, "HSLA(240,100%,63%,0)"
 		},
 		{
-			0.25f, 1, 0.25f, 1, "HSLA(120,100%,62%,1)"
+			0.25f, 1, 0.25f, 1, "HSLA(120,100%,63%,1)"
 		},
 		{
-			0.25f, 1, 0.25f, 0, "HSLA(120,100%,62%,0)"
+			0.25f, 1, 0.25f, 0, "HSLA(120,100%,63%,0)"
 		},
 		{
-			0.75f, 1, 0.25f, 1, "HSLA(80,100%,62%,1)"
+			0.75f, 1, 0.25f, 1, "HSLA(80,100%,63%,1)"
 		},
 		{
-			0.75f, 1, 0.25f, 0, "HSLA(80,100%,62%,0)"
+			0.75f, 1, 0.25f, 0, "HSLA(80,100%,63%,0)"
 		},
 		{
 			0.75f, 0, 1, 1, "HSLA(285,100%,50%,1)"
@@ -132,29 +132,15 @@ public class ColorToHslaStringConverterTests : BaseOneWayConverterTest<ColorToHs
 		},
 	};
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ValidInputData))]
 	public void ColorToRgbStringConverterValidInputTest(float red, float green, float blue, float alpha, string expectedResult)
 	{
 		var converter = new ColorToHslaStringConverter();
 		var color = new Color(red, green, blue, alpha);
 
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, new System.Globalization.CultureInfo("en-US"));
-		var resultConvertFrom = converter.ConvertFrom(color, new System.Globalization.CultureInfo("en-US"));
-
-		Assert.Equal(expectedResult, resultConvert);
-		Assert.Equal(expectedResult, resultConvertFrom);
-	}
-
-	[Fact]
-	public void ColorToRgbStringConverterCultureTest()
-	{
-		var expectedResult = "HSLA(0,0%,0%,0,5)";
-		var converter = new ColorToHslaStringConverter();
-		var color = new Color(0, 0, 0, 0.5f);
-
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, new System.Globalization.CultureInfo("uk-UA"));
-		var resultConvertFrom = converter.ConvertFrom(color, new System.Globalization.CultureInfo("uk-UA"));
+		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, Thread.CurrentThread.CurrentCulture);
+		var resultConvertFrom = converter.ConvertFrom(color, Thread.CurrentThread.CurrentCulture);
 
 		Assert.Equal(expectedResult, resultConvert);
 		Assert.Equal(expectedResult, resultConvertFrom);
diff --git a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToRgbaStringConverterTests.cs b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToRgbaStringConverterTests.cs
index 4cfabd94ce..5ced164ec0 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToRgbaStringConverterTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Converters/ColorToRgbaStringConverterTests.cs
@@ -163,20 +163,6 @@ public void ColorToRgbStringConverterConvertBackValidInputTest(float red, float
 		AssertColorComparison(expectedResult, resultConvertBackTo);
 	}
 
-	[Fact]
-	public void ColorToRgbStringConverterCultureTest()
-	{
-		var expectedResult = "RGBA(0,0,0,0,5)";
-		var converter = new ColorToRgbaStringConverter();
-		var color = new Color(0, 0, 0, 0.5f);
-
-		var resultConvert = ((ICommunityToolkitValueConverter)converter).Convert(color, typeof(string), null, new System.Globalization.CultureInfo("uk-UA"));
-		var resultConvertFrom = converter.ConvertFrom(color, new System.Globalization.CultureInfo("uk-UA"));
-
-		Assert.Equal(expectedResult, resultConvert);
-		Assert.Equal(expectedResult, resultConvertFrom);
-	}
-
 	[Fact]
 	public void ColorToRgbStringConverterNullInputTest()
 	{
diff --git a/src/CommunityToolkit.Maui.UnitTests/Extensions/ColorConversionExtensionsTests.cs b/src/CommunityToolkit.Maui.UnitTests/Extensions/ColorConversionExtensionsTests.cs
index d87ebba9ea..298f3ced73 100644
--- a/src/CommunityToolkit.Maui.UnitTests/Extensions/ColorConversionExtensionsTests.cs
+++ b/src/CommunityToolkit.Maui.UnitTests/Extensions/ColorConversionExtensionsTests.cs
@@ -288,7 +288,7 @@ public class ColorConversionExtensionsTests : BaseTest
 		new ColorTestDefinition(1, 1, 1, (float)0.84705883, 255, 255, 255, 216, 0, 0, 0, 0, 0, 0, 0, 1, false, false, Colors.White, Colors.Black)
 	];
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToRgbString(ColorTestDefinition testDef)
 	{
@@ -305,7 +305,7 @@ public void ToRgbStringNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToRgbaString(ColorTestDefinition testDef)
 	{
@@ -322,7 +322,7 @@ public void ToRgbaStringNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToCmykString(ColorTestDefinition testDef)
 	{
@@ -339,7 +339,7 @@ public void ToCmykStringNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToCmykaString(ColorTestDefinition testDef)
 	{
@@ -356,7 +356,7 @@ public void ToCmykaStringNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToHslString(ColorTestDefinition testDef)
 	{
@@ -373,7 +373,7 @@ public void ToHslStringNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToHslaString(ColorTestDefinition testDef)
 	{
@@ -390,7 +390,7 @@ public void ToHslaStringNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetByteRed(ColorTestDefinition testDef)
 	{
@@ -407,7 +407,7 @@ public void GetByteRedNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetByteGreen(ColorTestDefinition testDef)
 	{
@@ -424,7 +424,7 @@ public void GetByteGreenNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetByteBlue(ColorTestDefinition testDef)
 	{
@@ -441,7 +441,7 @@ public void GetByteBlueNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetByteAlpha(ColorTestDefinition testDef)
 	{
@@ -458,7 +458,7 @@ public void GetByteAlphaNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetPctBlackKey(ColorTestDefinition def)
 	{
@@ -475,7 +475,7 @@ public void GetPercentBlackKeyNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetDegreeHue(ColorTestDefinition def)
 	{
@@ -492,7 +492,7 @@ public void GetDegreeHueNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetPctCyan(ColorTestDefinition testDef)
 	{
@@ -509,7 +509,7 @@ public void GetPercentCyanNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetPctMagenta(ColorTestDefinition testDef)
 	{
@@ -526,7 +526,7 @@ public void GetPercentMagentaNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void GetPctYellow(ColorTestDefinition testDef)
 	{
@@ -543,7 +543,7 @@ public void GetPercentYellowNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToInverseColor(ColorTestDefinition testDef)
 	{
@@ -564,7 +564,7 @@ public void ToInverseColorNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToGrayScale(ColorTestDefinition testDef)
 	{
@@ -585,7 +585,7 @@ public void ToGrayScaleNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void IsDark(ColorTestDefinition testDef)
 	{
@@ -602,7 +602,7 @@ public void IsDarkNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void IsDarkForTheEye(ColorTestDefinition testDef)
 	{
@@ -643,7 +643,7 @@ public void GetPctYellowShouldNotCrashOnBlackColor()
 		Assert.True(true);
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToBlackOrWhite(ColorTestDefinition testDef)
 	{
@@ -660,7 +660,7 @@ public void ToBlackOrWhiteNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void ToBlackOrWhiteForText(ColorTestDefinition testDef)
 	{
@@ -677,7 +677,7 @@ public void ToBlackOrWhiteForTextNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithRed_Double(ColorTestDefinition testDef)
 	{
@@ -713,7 +713,7 @@ public void WithRedNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithGreen_Double(ColorTestDefinition testDef)
 	{
@@ -749,7 +749,7 @@ public void WithGreenNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithBlue_Double(ColorTestDefinition testDef)
 	{
@@ -787,7 +787,7 @@ public void WithBlueNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithRed_Byte(ColorTestDefinition testDef)
 	{
@@ -797,7 +797,7 @@ public void WithRed_Byte(ColorTestDefinition testDef)
 		Assert.Equal(red, result.GetByteRed());
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithGreen_Byte(ColorTestDefinition testDef)
 	{
@@ -807,7 +807,7 @@ public void WithGreen_Byte(ColorTestDefinition testDef)
 		Assert.Equal(green, result.GetByteGreen());
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithBlue_Byte(ColorTestDefinition testDef)
 	{
@@ -817,7 +817,7 @@ public void WithBlue_Byte(ColorTestDefinition testDef)
 		Assert.Equal(blue, result.GetByteBlue());
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithCyan(ColorTestDefinition testDef)
 	{
@@ -840,7 +840,7 @@ public void WithCyanNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithMagenta(ColorTestDefinition testDef)
 	{
@@ -863,7 +863,7 @@ public void WithMagentaNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithYellow(ColorTestDefinition testDef)
 	{
@@ -886,7 +886,7 @@ public void WithYellowNullInput()
 #pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
 	}
 
-	[Theory]
+	[CulturedTheory(cultures: ["en-US", "uk-UA", "de-DE"])]
 	[MemberData(nameof(ColorTestData))]
 	public void WithBlackKey(ColorTestDefinition testDef)
 	{
@@ -932,6 +932,8 @@ internal ColorTestDefinition(float r, float g, float b, float a,
 			float expectedAvgColor, bool expectedIsDark, bool expectedIsDarkForEye,
 			Color expectedToBlackOrWhite, Color expectedToBlackOrWhiteForText)
 		{
+			var culture = new System.Globalization.CultureInfo("en-US");
+
 			R = r;
 			G = g;
 			B = b;
@@ -956,17 +958,17 @@ internal ColorTestDefinition(float r, float g, float b, float a,
 			ExpectedGreyScale = new Color(expectedAvgColor, expectedAvgColor, expectedAvgColor);
 			ExpectedInverse = new Color(expectedInverseR, expectedInverseG, expectedInverseB);
 			ExpectedRgb = $"RGB({expectedByteR},{expectedByteG},{expectedByteB})";
-			ExpectedRgba = $"RGBA({expectedByteR},{expectedByteG},{expectedByteB},{A})";
+			ExpectedRgba = $"RGBA({expectedByteR},{expectedByteG},{expectedByteB},{A.ToString(culture)})";
 			ExpectedHexrgb = $"#{expectedByteR:X2}{expectedByteG:X2}{expectedByteB:X2}";
 			ExpectedHexrgba = $"#{expectedByteR:X2}{expectedByteG:X2}{expectedByteB:X2}{expectedByteA:X2}";
 			ExpectedHexargb = $"#{expectedByteA:X2}{expectedByteR:X2}{expectedByteG:X2}{expectedByteB:X2}";
-			ExpectedCmyk = $"CMYK({expectedPctCyan:P0},{expectedPctMagenta:P0},{expectedPctYellow:P0},{expectedPctBlack:P0})";
-			ExpectedCmyka = $"CMYKA({expectedPctCyan:P0},{expectedPctMagenta:P0},{expectedPctYellow:P0},{expectedPctBlack:P0},{a})";
+			ExpectedCmyk = $"CMYK({expectedPctCyan.ToString("P0", culture)},{expectedPctMagenta.ToString("P0", culture)},{expectedPctYellow.ToString("P0", culture)},{expectedPctBlack.ToString("P0", culture)})";
+			ExpectedCmyka = $"CMYKA({expectedPctCyan.ToString("P0", culture)},{expectedPctMagenta.ToString("P0", culture)},{expectedPctYellow.ToString("P0", culture)},{expectedPctBlack.ToString("P0", culture)},{a.ToString(culture)})";
 
 			Color = new Color(r, g, b, a);
 			ExpectedDegreeHue = Color.GetHue() * 360;
-			ExpectedHslString = $"HSL({ExpectedDegreeHue:0},{Color.GetSaturation():P0},{Color.GetLuminosity():P0})";
-			ExpectedHslaString = $"HSLA({ExpectedDegreeHue:0},{Color.GetSaturation():P0},{Color.GetLuminosity():P0},{a})";
+			ExpectedHslString = $"HSL({ExpectedDegreeHue:0},{Color.GetSaturation().ToString("P0", culture)},{Color.GetLuminosity().ToString("P0", culture)})";
+			ExpectedHslaString = $"HSLA({ExpectedDegreeHue:0},{Color.GetSaturation().ToString("P0", culture)},{Color.GetLuminosity().ToString("P0", culture)},{a.ToString(culture)})";
 		}
 
 		internal float R { get; }
diff --git a/src/CommunityToolkit.Maui/Converters/ColorToStringConverter.shared.cs b/src/CommunityToolkit.Maui/Converters/ColorToStringConverter.shared.cs
index f09148cebe..92ff2ceb03 100644
--- a/src/CommunityToolkit.Maui/Converters/ColorToStringConverter.shared.cs
+++ b/src/CommunityToolkit.Maui/Converters/ColorToStringConverter.shared.cs
@@ -57,7 +57,7 @@ public override Color ConvertBackTo(string value, CultureInfo? culture)
 	public override string ConvertFrom(Color value, CultureInfo? culture = null)
 	{
 		ArgumentNullException.ThrowIfNull(value);
-		return value.ToRgbaString(culture);
+		return value.ToRgbaString();
 	}
 }
 
@@ -172,7 +172,7 @@ public partial class ColorToCmykaStringConverter : BaseConverterOneWay<Color, st
 	public override string ConvertFrom(Color value, CultureInfo? culture = null)
 	{
 		ArgumentNullException.ThrowIfNull(value);
-		return value.ToCmykaString(culture);
+		return value.ToCmykaString();
 	}
 }
 
@@ -206,6 +206,6 @@ public partial class ColorToHslaStringConverter : BaseConverterOneWay<Color, str
 	public override string ConvertFrom(Color value, CultureInfo? culture = null)
 	{
 		ArgumentNullException.ThrowIfNull(value);
-		return value.ToHslaString(culture);
+		return value.ToHslaString();
 	}
 }
\ No newline at end of file