Gum Bichromate – across the roof tops of Lucca, Tuscany, Italy

Posted by on Dec 20, 2016 in Uncategorised | No Comments

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 […]