sgraffito

Sgraffito is a technique either of wall decor, produced by applying layers of plaster tinted in contrasting colors to a moistened surface, or in ceramics, by applying to an unfired ceramic body two successive layers of contrasting slip, and then in either case scratching so as to produce an outline drawing.

Needs a better image..previous one was showing incising, but he sgraffito wasn't showing well enough.

sources?

Someone at the scratching stage of producing a sgraffito dish