smoke proof
noun1
Media, Publishing, Typography Historical A temporary print made from a thin coating of carbon deposited on the punch surface by a candle flame, used in evaluating the progress of the design of the punch.
- Progress was observed from time to time by holding the end of the punch in the sooty flame of a candle or lamp and by pressing it on slightly damp paper to make a smoke proof.2009, James Mosley, edited by Michael F Suarez and Michael L Turner, The Cambridge History of the Book in Britain, vol. V, Cambridge, published 2014, page 171: