Printing the first layer of 4-color gum print on a paper attached to aluminum.

Mixing the the sensitizer for the first gum layer. There will be 3 ml of the stock pigment + 6 ml gum + 4 ml distilled water + 4 ml potassium dichromate 13% + Tween 20 1:3 2 drops — that makes 17 ml of the sensitizer in total, for a 26 by 42 cm print.

Coating the paper with the first pigment layer, ivory black in this case.

Registering and taping down the negative for the black layer.

Exposing in a vacuum frame of a plateburner.

Developing the print in water after the exposure.

The first layer (ivory black) of the gum print.