This engraving process aims to imitate the tones and nuances of chalk drawings and pastels. It is probably the most labour-intensive print process. The entire surface of a copper plate is roughened with a rocker , a finely serrated instrument which punches the copper, creating a series of depressed areas and burrs. The result is a rough surface which would print in black. Semi-tones and light areas are created by partially burnishing and scraping the burr. When creating colour mezzotints, a separate plate is used for each colour; these are printed on top of each another, one by one.

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