%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example D-11-6 on page .
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  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.
%% 

\documentclass{ttctexaplate}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{413.44133pt}
\StartShownPreambleCommands
\usepackage{array,multicol}%
      \usepackage[table,showerrors,dvipsnames]{xcolor}
      \makeatletter
        \def\testclr#1#{\@testclr{#1}}
        \def\@testclr#1#2{{\fboxsep\z@\fbox{\colorbox#1{#2}{\phantom{XXXX}}}}}
      \makeatother

\StopShownPreambleCommands
\begin{document}
\small
\def\test#1{\testclr{#1}& \texttt{#1}}
\def\X#1{\test{#1}& \test{-#1}}
\begin{tabular}{@{}l@{ \ }ll@{ \ }l@{}}
\X{red}\\
\X{red!75}\\
\X{red!75!green}\\
\X{red!75!green!50}\\
\X{red!75!green!50!blue}\\
\X{red!75!green!50!blue!25}\\
\X{red!75!green!50!blue!25!gray}\\
\end{tabular}
\end{document}