Gum bichromate is a 19th-century photographic printing process based on the light sensitivity of dichromates. It is capable of rendering painterly images from photographic negatives. I used pigments and watercolour with chemicals to develop this photograph from my negative.

Palladium print, photograph, palladiotype – is process where photograph is developed from negative (my original negative) using metal salt – palladium salt. Unlike the silver print process, Palladium lies on the paper surface, while silver lies in a gelatin or albumen emulsion that coats the paper. As a result, since no gelatin emulsion is used, the final palladium image is absolutely matte with a deposit of palladium absorbed slightly into the paper.

The Vandyke brown print is based on the first iron-silver process, the argentotype, invented in 1842 by the English astronomer, Sir John Herschel. Both processes utilize the action of light on ferric salts and their chemistry is very similar. The Vandyke process gets its name from its similarity in color to the deep brown pigment used by the Flemish painter Van Dyck. I used my own negative to produce this wonderful, rich print.


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