gum bichromate:
Developed by A. Poitevin (mid 19th century.) And later by J. Pouncy, gum bichromate photographic process is sometimes called "pictorial" which consists of a mixture of gum arabic (colloid) and potassium dichromate (sensitizer) which was added a pigment (powder, gouache or watercolor) and the was extended with a brush on paper the most.
The paper is dried and then exposed to UV through a negative and development is done with water.
A recent exhibition at the Musée de l'Orangerie in Paris showed the work of photographer Heinrich Kühn has widely used this method to 1897.
French side is Constant Puyo Demachy and Robert who have made prints with gum bichromate.
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