Math & Science ⇒ Problem with Summation and colours

[gfink]

Hi, I am trying to display a summation with different colours.
I have defined something like

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\newcommand{\a}[1]{\color{blue}#1\color{black}}
\newcommand{\b}[1]P\color{red}#1\color{black}}

Throughout my document when I want a red varible or blue varible I put

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$x = \a{b} + \b{r}$

But when I want an equation with a summation as in

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\begin{equation}\sum\limits^{\a{b}}_{\b{r}}\end{equation}

It wont put the r below the summation sign.
Any ideas?
Thanks!
Geoff

[localghost]

An example derived from the »Math mode« document.

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\documentclass[11pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{xcolor}

\newcommand*{\tcb}[1]{\textcolor{blue}{#1}}
\newcommand*{\tcr}[1]{\textcolor{red}{#1}}

\begin{document}
  \begin{equation}
    \sum^{\tcb{b}}_{\tcr{r}}
  \end{equation}
\end{document}

Thorsten

[Stefan Kottwitz]

Hi Geoff,

I can confirm that it already works when you use \textcolor instead of \color, such as

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\newcommand{\a}[1]{\textcolor{blue}{#1}}
\newcommand{\b}[1]{\textcolor{red}{#1}}

Stefan

[gfink]

Thanks for the fast response!
It's working for me now too