Quote:
Originally Posted by slipk1068
Limestone crayon on a stone printing plate?
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Yes. The stones used when it was actually stones were limestone, and the process basically put a substance on the plate that was oil based. The limestone holds enough water to repel the ink while the other stuff holds the oily ink. So to remove something from what would print, just cover it with a bit of limestone. (Actually more like wear it off and fill the etched area it was in with limestone )
Modern plates are aluminum with a limestoneish coating. So the crayon works just as well.
And adding stuff to what prints is possible by scratching the plate. on modern plates the coating is gone and ink sticks to the aluminum. On stones, the scratch has to be a bit deeper, so it fills with ink.
Steve B