SCUMEX and parmesan
It is common for draftsmen to sprinkle SCUMEX (powdered rubber eraser) on tracings prior to doing any drawing on it. This reduces smearing of the pencil marks and such and results in a cleaner tracing.
At a former employers we had replaced the Scumex at one draftsmans desk with dried parmesian cheese. It looked about the same. It was extremely interesting watching him draw for a while and then begin to smell the paper. Took the poor dude almost 10 minutes to guess that he had been gigged!
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