Mottle
WordNet
noun
(1) An irregular arrangement of patches of color
"It was not dull grey as distance had suggested, but a mottle of khaki and black and olive-green"
verb
(2) Colour with streaks or blotches of different shades
(3) Mark with spots or blotches of different color or shades of color as if stained
WiktionaryText
Verb
- To mark with spots of different color, or shades of color, as if stained; to spot; to maculate.