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WordNet
nigrify
  1. v. make or become black; "The smoke blackened the ceiling"; "The ceiling blackened" [syn: blacken, melanize, melanise, black] [ant: whiten]

  2. [also: nigrified]

Usage examples of "nigrify".

Now to reduce the new substance, calcine and nigrify it, till it was indeed the first matter, without qualities.