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From George Eastman House : Notes On Photographs

The most light sensitive of all the iron salts, these greenish scales are soluble in water. Ferric oxalate was used as a sensitizer in both the platinum and kallitype processes.^[1]

1. ↑ Osterman, Mark. 2007. Ferric Oxalate, Fe₂(C₂O₄)₃. In The Focal Encyclopedia of Photography: Digital Imaging, Theory and Applications, History, and Science, ed. Michael R. Peres, 76, Focal Press.