User blog comment:P進大好きbot/How to Write LaTeX in This Wiki/@comment-39448260-20191129022408/@comment-44450993-20191129022831

JK i think you get that by the code \color{#HHHHHH}{SOMETHING} in between the latex tags where H is a hex digit and SOMETHING is anything you want.

Like this:

\(\color{#FFFF00}{\blacksquare^{\blacksquare}}\)