A technical dictionary of printmaking, André Béguin.
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Charcoal
Charcoal and more precisely willow and linden charcoal are used in polishing* metal plates for engraving. When bought this charcoal is in the shape of a large rectangular stick. Before using it wear down the end to a 45° angle as compared to the horizontal surface. The charcoal stick should then be rubbed back and forth in a bath of mineral oil or oil. The rubbing must always be done at the same angle and in the same direction. A pumicing* of the plate must be done before using the charcoal since the latter is not able to even up the plate nor is it suited to removing deep scratches. [ abrasive substances].
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