Represent the binding offset next to the page margin as a shaded region

Question

I am using the bindingoffset command of the geometry package to shift the page margin in order to compensate for the actual binding. Is there any way to represent this offset from bindingoffset as a shaded region on the page? I'd like to have it visible on the page to be able to distinguish it from the actual page margin.
Below is a mock-up of what I'm trying to achieve. The shaded region represents the bindingoffset's length e.g. 10mm.

Bernard · Answer

Easy with eso-pic. Here is an example with two-sided printing:
documentclass[12pt]{book}
usepackage{lipsum}
usepackage{indentfirst}
usepackage[top=3cm, bottom=3cm, left=3cm, right=2cm, bindingoffset=1cm, showframe]{geometry}
usepackage[svgnames]{xcolor}
usepackage{eso-pic}
usepackage{etoolbox}

AddToShipoutPictureBG{AtPageLowerLeft{color{Gainsboro}ifnumodd{arabic{page}}{}{hspace*{dimexprpaperwidth-1cm}}rule{10mm}{paperheight}}}

begin{document}

tableofcontents
chapter{Introduction}
lipsum[1-20]

end{document}

Represent the binding offset next to the page margin as a shaded region

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