XColor Structure

SystemObject
  SystemValueType
    RCS.Carbon.SharedXColor

[TypeConverterAttribute("RCS.Carbon.Shared.XColorConverter")]
public struct XColor : IEquatable<XColor>

Note that the TypeConverter attribute on the struct uses the string name of the converter class instead of the usual typeof(name) syntax. During Jupyter notebook testing it was found that the typeof silently failed to resolve the converter and serializing this struct in proeprties would crash. Switch to the string constructor fixed the problem. Only one web search result was found to mention this: https://stackoverflow.com/questions/26109228/typedescriptor-getconverter-doesnt-return-my-converter/26115666#26115666