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Right, I remember them being called "ditto" as well, and that there were different colors available (though purple was the most common). This was the process that used a sheet of waxy stuff that would be impressed on a transfer sheet by typing or with a pen/pencil/stylus, then the transfer sheet would be used to run off copies onto paper by using a solvent to transfer the ink to paper. I also remember stencils, which took a special typewriter and sort of oozed ink from a central drum through the letter holes punched in the stencil material. What was mimeographing, then?
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