Artificial intelligent assistant

nigrify

nigrify, v.
  (ˈnɪgrɪfaɪ)
  Also 7 nigrefie.
  [ad. L. nigrificāre to blacken, f. niger black + facĕre to make.]
  trans. To blacken.

1656 in Blount Glossogr. 1721 in Bailey. 1800 Lamb Lett. v. 44 'Twould have been but giving a polish to lamp-black, not nigrifying a negro primarily. 1870 Observer 9 Oct., Using a tar brush to nigrify the white and shining celebrities. 1893 Scott. Leader 27 Sept., The old part..has now become completely nigrified.

Oxford English Dictionary

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