smoke proof

名词 n.
中文释义

英文释义

名词 n.
  1. 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. historical
    — 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.

词形变化

smoke proofs plural
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