It is a drawing made by the engraving of more or less hard surfaces. In the renaissance it was used to decorate the façades of the buildings.
After reproducing the drawing, by means of a metal stylus named scratch the outer side of the plasterin is scratched until the underlying layer, previously prepared with a different colour, is uncovered.
Graffiti is a mixed technique of drawing and sculpture. The sign and the graphic effect belong to the drawing and the relief effect belongs to the sculpture.

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