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1918 Photo-miniature Mar. (Gloss.) Gum-platinum process—of first making a light print on platinum paper, then coating the print with sensitive gum mixture and reprinting from the same negative.

1919 Brit. Jrnl. Photogr. Almanac 252 Gum-platinum is a compound process, in which a pale print on platinum paper is coated with the sensitive gum mixture, and a second (pigment) image produced by re-printing under the same negative.