%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-01-10 on page 16.
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}

\usepackage{xcolor}

\begin{document}
Current colour test with \texttt{\string\definecolorseries}:     \par
\color{blue}    \definecolorseries{foo}{rgb}{last}{.}{-.}
\resetcolorseries[5]{foo}
\def\test{\hbox to 2em{{\color{foo!!+}\vrule width 2em height 2ex}}}
Test\test\test\test\test\test\test Test                   \par
\resetcolorseries[5]{foo}
\def\test{\hbox to 2em{{\color{foo!!++}\vrule width 2em height 2ex}}}
Test\test\test\test\test\test\test Test                   \par
\resetcolorseries[5]{foo}
\def\test{\hbox to 2em{{\color{foo!![2]}\vrule width 2em height 2ex}}}
Test\test\test\test\test\test\test Test
\end{document}