When choosing or creating custom color combinations in ArcMap, you currently have the option to input RGB, HSV, or CMYK color values. Add HEX To This!!!!
ArcGIS Pro includes allows the ability to enter a hexadecimal color value: Color—ArcGIS Pro | ArcGIS Desktop
Colors can be defined in one of six color models:
When you use the RGB, HSV, or HSL color models, you can also enter a hexadecimal value in the HEX # box to define the color
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