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Tirage fresson en quadrichromie

Sensitising is achieved by dipping the paper in a potassium bichromate solution. During the exposures, each coloured image is obtained by negative enlargement with a corresponding selection filter (for the blue, green or red selection negative). Under the action of the light, the bichromated colloid becomes insoluble. During development, the areas not exposed are eliminated by solubilising in hot water. After every cycle, gelatine is applied to the pigmented layer. Then the print is washed to remove any residual trace of bichromate, then dried in the open air and in a heated press. Retouching may be done before applying a finish, protective gelatine coat.

The Fresson process produces results similar to those of gum bichromate techniques. The paper used has a maximum size of 62 × 92 cm, with a smooth surface, and the final image is matte with saturated colours.

Prints are known for their good light stability, explaining the preference shown by professional photographers during the 1970s and 1980s for this process rather than chromogenic prints.

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