public WorkbookColorPalette Palette {get;}
When the file is opened in Microsoft Excel 2003 and earlier versions, the actual colors used in cells and shapes may not be displayed. Instead, the closest color in the palette will be displayed instead. Therefore, the palette can be customized if necessary to keep the colors as accurate as possible in older versions of Excel.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+