mottle

nouns

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"
mottle
is a type of (narrower)
a visual attribute of things that results from the light they emit or transmit or reflect
"a white color is made up of many different wavelengths of light"
color, coloring, colour, colouring

verbs

mark with spots or blotches of different color or shades of color as if stained
blotch, mottle, streak
is derived from
mottling
colour with streaks or blotches of different shades
cloud, dapple, mottle
is derived from
mottling