ebonizing

from The Collaborative International Dictionary of English v.0.48

Ebonize \Eb"on*ize\, v. t. [imp. & p. p. {Ebonized}; p. pr. &
   vb. n. {Ebonizing}.]
   To make black, or stain black, in imitation of ebony; as, to
   ebonize wood.
   [1913 Webster]