Thanks to all who provided ideas and spots to look for the materials.

I actually don't want it for copying. I built a small unit for
electrochemically etching marks on metal. I've experimented with a few
different electrolytes and am also looking at different stencil
materials. I was recently told be someone that these old mimeograph
stencils would work well and thought I'd give them a try. Curious to
see how they compare, price and quality, with the real deal from some
of the marking companies.

Thanks,
Al