"mottling" in the noun sense
1. mottling
the act of coloring with areas of different shades
"mottling" in the verb sense
1. mottle, streak, blotch
mark with spots or blotches of different color or shades of color as if stained
2. mottle, dapple, cloud
colour with streaks or blotches of different shades
Source: WordNet® (An amazing lexical database of English)
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