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.
- ↑ 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.