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Tirage à la gomme bichromatée

Most often, however, gum bichromate prints have warm colours ranging from orange to dark brown. The technique therefore requires know-how and a good command of the gestures involved to avoid excess thickness, or conversely areas without a sensitive layer. The original appearance of the paper, mostly watercolour paper; gives a grainy surface to the image. After drying, the now photosensitive paper is brought into contact with a negative in a printing frame. Gum bichromate has the property of hardening when exposed to ultraviolet rays. Thus, after exposure, the paper is placed in a basin of water and "stripped" by using a brush. The exposed parts will remain while the still soluble parts will be eliminated with the water, taking the pigment with them and again showing the paper. The sheet is then allowed to dry.

Depending on the desired effect several passages are often necessary. The steps must therefore be repeated as necessary.
Once the final rendering is obtained, the sheet is immersed in a sodium bisulfite bath which removes bichromate residues and it is again rinsed with water and dried.

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