log in helplinksabout
SEARCH

Editing

Toolbox

Print Room

Discussion

Personal
tools

feedback

Potassium Ferrocyanide

From George Eastman House : Notes On Photographs

Jump to: navigation, search

Potassium ferrocyanide is a yellow crystal also known as yellow prussiate of potash. It was made by stirring hot potassium carbonate with wool or horn clippings with an iron rod. It is soluble in water 1:4 but not in alcohol. Potassium ferrocyanide was used as a developer for some iron processes and as an additive for alkaline pyro developers.[1]


  1. Osterman, Mark. 2007. Potassium Ferrocyanide, K4Fe(CN)6*3H2O. In The Focal Encyclopedia of Photography: Digital Imaging, Theory and Applications, History, and Science, ed. Michael R. Peres, 108, Focal Press.