Change math color globally [duplicate]

Question

I would like to change the color of anything that is in mathematical mode, in all my document.

Is it possible?

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PS: The solution I've found so far is

\everymath{\color{red}}
\everydisplay{\color{red}}
\def\m@th{\normalcolor\mathsurround\z@}

but it cancels the command \everymath{\displaystyle}