SCUMBLING
Verb
scumbling
present participle of scumble
Noun
scumbling (plural scumblings)
An application of scumbling; an opaque glaze.
Source: Wiktionary
Scum"bling, n.
1. (Fine Arts)
(a) A mode of obtaining a softened effect, in painting and drawing,
by the application of a thin layer of opaque color to the surface of
a painting, or part of the surface, which is too bright in color, or
which requires harmonizing.
(b) In crayon drawing, the use of the stump.
2. The color so laid on. Also used figuratively.
Shining above the brown scumbling of leafless orchards. L. Wallace.
SCUMBLE
Scum"ble, v. t. [imp. & p. p. Scumbled; p. pr. & vb. n. Scumbling.]
Etym: [Freq. of scum. sq. root 158.] (Fine Arts)
Definition: To cover lighty, as a painting, or a drawing, with a thin wash
of opaque color, or with color-crayon dust rubbed on with the stump,
or to make any similar additions to the work, so as to produce a
softened effect.
Source: Webster’s Unabridged Dictionary 1913 Edition