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Pigment printing

A photographic letterpress printing technique to mimeograph graphical templates. Pigment paper is covered with a layer of gelatin, then rendered light-sensitive in a potassium bichromate solution and exposed under a negative. The gelatin now becomes water-insoluble. The exposed pigment paper is developed in lukewarm water with the gelatin and the containing colour pigments being washed off the hardly and not exposed areas. A side-inverted positive is the result.

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