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One can use the command such as \textcolor[rgb]{1.00,0.00,0.00}{boundary} to color the word "boundary" in a document.

Here is my question:

How to color the math symbols in $$? For example, can one turn $C^{2}$ into red in LaTeX?

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Sort of related question: tex.stackexchange.com/q/335/86 –  Loop Space Jun 25 '11 at 19:50
    
In \eqnarray environment, I find that curly bracketing can control the range of coloring. For example, {\color{red}{some symbols}} will ensure that math symbols after '}' are not colored. –  EKG Jun 13 '12 at 19:56
    
Don't use eqnarray. –  kahen Oct 16 '12 at 0:28
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1 Answer 1

up vote 34 down vote accepted

\textcolor from the xcolor package also works in mathmode, even if the name says otherwise. You can also use $ \color{<color>} C^2 $. It sets the color for the rest of the current scope (group).

Examples:

\documentclass{article}

\usepackage{xcolor}

\begin{document}

$ \color{red} C^2 $

$ \color{yellow} A = \textcolor{blue}{B} \mathbin{\textcolor{red}{-}} \textcolor{green}{C} $

\end{document}

Note that the \mathbin must be wrapped around the coloured, binary - here, as Leo Liu pointed out in his comment, to set the correct spacing again. The coloring changes the math type so they spacing would be different.

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10  
There's a little problem: \textcolor{red}{-} makes it a \mathord, but it should be a \mathbin. Use \mathbin{\textcolor{red}{-}} to get proper spacing. –  Leo Liu Jun 26 '11 at 2:23
    
@Leo: Thanks, fixed. I wasn't sure about that myself. –  Martin Scharrer Jun 26 '11 at 8:47
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