%% 
%%  An UIT Edition example
%% 
%%  Example 05-00-1 on page 71.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{129.70511pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{xcolor}
\StopShownPreambleCommands
\begin{document}
\colorbox{red}{red}      \\
\colorbox{red!75}{red!75}\\
\colorbox{red!75!blue!100}{\color{white}red!75!blue!100}\\
\colorbox{red!75!blue!40}{red!75!blue!40} \\
\colorbox{red!75!blue!40!yellow!50}%
  {red!75!blue!40!yellow!50} \\[6pt]
%
\colorbox{-red}{-red} \\
\colorbox{-red!75}{-red!75} \\
\colorbox{-red!75!blue!100} {-red!75!blue!100} \\
\colorbox{-red!75!blue!40}{\color{white}-red!75!blue!40}\\
\colorbox{-red!75!blue!40!yellow!50}%
  {\color{white}-red!75!blue!40!yellow!50}
\end{document}