The Collaborative International Dictionary of English v.0.48:
Tint \Tint\, v. t. [imp. & p. p. Tinted; p. pr. & vb. n. Tinting.] To give a slight coloring to; to tinge. [1913 Webster]WordNet (r) 3.0 (2006):
tinting n 1: the act of adding a tinge of color; "the hairdresser gave her hair a modest tinting"