ALTlab Journal

Based on the light sensitivity of dichromates, this is an early photographic print process developed in the 19th century. Its organic nature and painterly rendering of images are uniquely inspiring and interesting. It is a multi-layering process but a single layer can also do the job in respective cases. Colorful images can be achieved by the careful use of layers.

Tanima, resident artist at Goa cap, is exploring this alternative printing process.

This process of printing can sometimes be combined with other alternative processes like the cyanotype or platinotype.

Chemicals :

  • Gum Arabic solution (pre-mixed solution recommended)
  • Water color pigment in powder or tubes (tube colors recommended)
  • Ammonium, sodium, or potassium dichromate crystals (potassium dichromate recommended)
  • Gelatin
  • Chrome alum
  • Potassium metabisulfite
  • Dropper bottle for dichromate solution
  • Cone-top fabric paint bottle for each color/gum solution
  • Contact printing frame or vacuum exposure frame
  • Sponge or brush for applying emulsion
  • Camel hair brush and/or…

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