Remove or soak more, as long as overnight. Gently splashing or brushing can speed development but emulsion is fragile, so be careful. 5 Dry flat or hang up. Wipe up spills. 14 degree Baume gum acacia solution used in lithography may be used straight from the bottle instead.
Ammonium bichromate is more sensitive to light than potassium bicromate.
Bichromate is also sometimes called dichromate. Label containers clearly. Sensitizing Make sensitizer from one part gum solution, one part bichromate solution, and some pigment. Use any pigments that mix in water, such as watercolors, poster paint, or powdered pigment. Amounts of pigment vary.