Copper Ferrocyanide. This is not a lightfast pigment, with results ranging from moderate to poor. It also has toxicity as it is rated "B". More information about health issues associated with Iron and Silica can be found in The Artist's Guide to Health and Safety.
PBr9 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Possibly Poor
Poor. Not recommended as it can fade out completely in tints.
Hazard, Use more caution
Treat all pigments and paints with studio safety protocols.
Copper hexacyanoferrate(II)
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