Hypertext Webster Gateway: "mottling"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Mottle \Mot"tle\, v. t. [imp. & p. p. {Mottled}; p. pr. & vb. n.
{Mottling}.] [From {Mottled}.]
To mark with spots of different color, or shades of color, as
if stained; to spot; to maculate.
From WordNet (r) 1.7 (wn)
mottling
n : the act of coloring with areas of different shades
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