[Snyper1]

Is there a site or list that has every single game text colour?

[Abernethy]

Yeah, some are.
~r~ red
~y~ yellow
~g~ green
~b~ blue
~n~ new line.
There is a link, try samp wiki.

[Joe Staff]

~l~ - Black
~p~ - Purple
~h~ - Lighter Hue of previous color

Plus the ones mentioned previously, I think that's it