Style Parcolumns vertical bar

Question

How can I style the vertical bar in parcolumns that appears when using rulebetween=true?

I am trying to do something similar to what you can do with \vrule like the below:

\newcommand\VRule{\color{gray}\vrule width 0.5pt}

Here is what I have currently:

\documentclass{article}
\usepackage[margin=1in]{geometry}% http://ctan.org/pkg/geometry
\usepackage{lipsum}% http://ctan.org/pkg/lipsum
\usepackage{parcolumns}% http://ctan.org/pkg/parcolumns
\begin{document}
    \begin{parcolumns}[nofirstindent,colwidths={1=2cm},rulebetween=true]{2}
        \colchunk[1]{\noindent 1770 }
        \colchunk[2]{\noindent \lipsum [1-3]}
    \end{parcolumns}
\end{document}

Answer 1

Just patch the \pc@placeboxes command; be sure to provide a definition for \VRULE, however.

\documentclass{article}
\usepackage[margin=1in]{geometry}
\usepackage{lipsum}
\usepackage{parcolumns}
\usepackage{color}

\usepackage{etoolbox}
\makeatletter
\patchcmd{\pc@placeboxes}{\vrule}{{\VRULE}}{}{}
\makeatother
\newcommand\VRULE{\color{red}\vrule width 0.5pt}


\begin{document}

\begin{parcolumns}[nofirstindent,colwidths={1=2cm},rulebetween=true]{2}
\colchunk[1]{\noindent 1770 }
\colchunk[2]{\noindent \lipsum [1-3]}
\end{parcolumns}

\end{document}