Support for colour in XeLaTeX
https://www.ctan.org/pkg/xecolour
Vafa Khalighi, who was maintaining xecolour, handed maintenance to this bidi-tex GitHub Group (which initially consists of members of the LaTeX3 team).
Issues may be entered here.
If it proves necessary to update the files, this repository will be filled with files retrieved from CTAN:
http://mirrors.ctan.org/obsolete/macros/xetex/latex/xecolour.zip