Oil pigment process

A printing process, invented by G.H.Rawlins in 1904. He got a hint from photolithographic process of collotype which utilizes the reaction of water and oil. The mixture of geratin and potassium dichromate on paper is exposed to light under negative. Moistened with water, the part of geratin which the light has not fallen on is hardened and not contain the water. Then treating with oily ink applied with brushing ,the ink is taken up in proportion to the hardening and theink repels the wet part. thus the picture is come out.

Japan Pictorialism History @@@Camera and Lens

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All Images (C) Kimiaki Ishizuka