The Collaborative International Dictionary
Variegating
Variegate \Va"ri*e*gate\, v. t. [imp. & p. p. Variegated; p. pr. & vb. n. Variegating.] [L. variegatus, p. p. of variegare to variegate; varius various + agere to move, make. See Various, and Agent.] To diversify in external appearance; to mark with different colors; to dapple; to streak; as, to variegate a floor with marble of different colors.
The shells are filled with a white spar, which
variegates and adds to the beauty of the stone.
--Woodward.
Wiktionary
variegating
vb. (present participle of variegate English)