Definition:
Sgraffito (noun) is the technique of incising down through a layer of applied slip to the clay body below, in which the clay and slip are of contrasting colors. The term is from the Latin for scratch (as with a stylus) which is also the root for "graffiti" and "graphic" (as in to write).
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Sgrafitto has been used in cultures across the globe to decorate their pottery wares.