Potassium Dichromate
K₂Cr₂O₇
Gum bichromate printing
You mix:
- gum arabic
- pigment/watercolor
- potassium dichromate
Coat paper → expose under UV with a negative → wash out soft areas.
Photo gelatin resist / etching
UV hardens gelatin or glue:
- softer parts wash away
- hardened parts resist acid, ink, dye, or water
Useful for:
- intaglio experiments
- stencils
- silkscreen hybrids
- laser + photo resist combinations
- textile resist work