scumble

verb (used with object), scum·bled, scum·bling.

1. to soften (the color or tone of a painted area) by overlaying parts with opaque or semiopaque color applied thinly and lightly with an almost dry brush.

noun

2. the act or technique of scumbling.
3. the effect produced by this technique.

verb

1. (in painting and drawing) to soften or blend (an outline or colour) with an upper coat of opaque colour, applied very thinly

noun

2. the upper layer of colour applied in this way
3. the technique or effects of scumbling