LaTeX——如何读取颜色的当前值？

Question

我想保存当前文本颜色，然后更改它，然后改回原始颜色。我当时想做这样的事情：

\def\oldcolor{old colour here}    % save colour
\color{red}                       % set colour to new colour
Some text                         % arbitrary length text, perhaps with more colour changes
\color{\oldcolor}                 % restore old colour

但我找不到用什么来代替“此处为旧颜色”。我如何读取颜色的当前值，或者在哪里可以找到此信息？

Answer 1

\documentclass{article}
\usepackage{xcolor}
\begin{document}
\color{green}             % set color
\colorlet{oldcolor}{.}    % save current colour, internally named as .
\color{red}               % set colour to new colour
Some text                 
\color{oldcolor}          % restore old colour    
Some text    
\end{document}