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Invented in 1850 by Firmin Gilot, this was a now obsolete process whereby a lithographic plate was turned into a relief block. A lithographic drawing was made on or transferred to zinc and dusted with resin which stuck to the drawn parts and acted as an acid-resist when the plate was immersed in acid, as in the process of etching. The resulting relief block was then inked and printed from. Many of Daumier's lithographs were transformed in this manner before they were printed in newspapers, the relief illustrations being perfectly compatible with the blocks of type used.

Subjects: Art.

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