work around Axiom Verge spec violation
https://gist.github.com/flibitijibibo/ffdd7c6fe32b9846a83807dab24be8fd

Index: src/Color.cs
--- src/Color.cs.orig
+++ src/Color.cs
@@ -1392,6 +1392,25 @@ namespace Microsoft.Xna.Framework
 			private set;
 		}
 
+		/* The following custom colors are to support Axiom Verge */
+		public static Color CustomRed
+		{
+			get;
+			private set;
+		}
+
+		public static Color CustomGreen
+		{
+			get;
+			private set;
+		}
+
+		public static Color CustomBlue
+		{
+			get;
+			private set;
+		}
+
 		#endregion
 
 		#region Internal Properties
@@ -1422,6 +1441,11 @@ namespace Microsoft.Xna.Framework
 
 		static Color()
 		{
+			/* The following custom colors are for support for Axiom Verge */
+			CustomRed = new Color(255, 141, 160);
+			CustomGreen = new Color(144, 238, 144);
+			CustomBlue = new Color(113, 231, 255);
+
 			Transparent = new Color(0);
 			AliceBlue = new Color(0xfffff8f0);
 			AntiqueWhite = new Color(0xffd7ebfa);
