stumbling

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. [ 1913 Webster ]

2. The color so laid on. Also used figuratively. [ 1913 Webster ]

Shining above the brown scumbling of leafless orchards. L. Wallace. [ 1913 Webster ]