%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 02-01-6 auf Seite 16.
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%%  Copyright (C) 2016 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
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%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{xcolor}
\definecolorset{rgb}{}{}{red,1,0,0;green,0,1,0;blue,0,0,1}
\providecolorset{rgb}{}{H}{red,0.5,0,0;green,0,0.5,0;blue,0,0,0.5}
\newcommand*\col[1]{\color{#1}\rule{3cm}{5mm}}
%StopShownPreambleCommands
\begin{document}
{\col{red}}\\    {\col{green}}\\    {\col{blue}}\\[4pt]
{\col{redH}}\\   {\col{greenH}}\\   {\col{blueH}}
\end{document}