Carbon Paper Casting
Post-Script: Of course, using carbon paper with one's endless roll of paper could prove troublesome, since you can't find an endless roll of carbon paper, unless you did one of those Breaking Bad-style, late-night break-ins to the carbon paper factory. Which I don't recommend. Typing via carbon paper reminded me about the Summer of '08, a formative time in the Typosphere when Strikethru and others were coating paper with thick layers of colorful crayon wax and using that as a form of stencil to type upon, transferring the colored wax to another sheet. I also tried typing onto aluminum foil, which was interesting. For those of you new to the Typosphere, it might provide hours of fun doing some research into the archives of the Typosphere, and try your hand at pressure-transfer typing.