Quote:
Originally Posted by FMP
This is a curiosity I wanted to share in case it could be of any use.
I commonly scribble on pdf files generated with LaTeX. In doing so, I noticed that the scribbles on a page with a hyperlink happen to be merged into pdf with the color of the hyperlink.
For instance, running pdflatex on the file:
%%%%%%%%%%
\documentclass{article}
\usepackage{hyperref}
\begin{document}
\section{Black}
\newpage
\section{Green\protect\cite{Wikipedia}}
\newpage
\section{Red\protect\footnote{Footnote.}}
\newpage
\begin{thebibliography}{0}
\bibitem{Wikipedia}
\href{http://en.wikipedia.org/}{Blue}.
\end{thebibliography}
\end{document}
%%%%%%%%%%
generates four pages, respectively with no hyperlink and a green, red, and light blue hyperlinks. Scribbling on this pdf and merging will result on a pdf with scribbles in black, green, read, and light blue. A pdf file so generated with this effect is attached.
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I didn't bother to find the cause of this erratic behaviour (so it might still be present in the hack), but since you seemed to look out for colors... so you might be interested in the color_pdf_tools hack (check software wiki).
Cheers!