Gum Bichromate – across the roof tops of Lucca, Tuscany, Italy
Getting to grips with the Gum Bichromate printing process. Gum prints are produced by brushing onto a sheet of watercolour paper a gum arabic solution mixed with potassium dichromate and a water colour pigment. After drying the sheet is exposed to UV light through a negative in contact with the paper where the dichromate hardness the gum […]
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