Olivier SAUDAN (1957), “Noir”, 1989, 6 zincographs in their wooden case, Éditions Franz Mäder, print no. 21/25, Ré and Grobety workshops, Renens. H. 53 x 38 x 4 cm Good condition Zincography is a planographic printing process based on the repulsion between water and fatty substances, in which the design is drawn with ink or a grease pencil on a zinc plate. Whilst in etching, acid is used to etch deep grooves into the metal through a varnish, here the acid serves only to fix and make the surface of the zinc plate hydrophilic where there is no oil-based drawing. Zincography is generally printed flat, in the same way as a lithograph.