Low lightfastness and also toxicity issues. Monona Rossol writes that it may be contaminated with PCBs --also please see her work regarding issues with a cancer causing compound (we advise artists to research benzidine in artist pigments). Unfortunately, a reputable artist pigment manufacturer uses this as a single-pigment imitation of Cadmium Orange. It also crops up in a handful of convenience blends- at least six- by another paintmaker. This color has shockingly low lightfastness in tints, as low as 3 on the Blue Wool Scale.
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Benzidine Orange
PO13
Alternate Name
Pyrazolone Orange
Pigment Description
Resources
PO13 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com,
Rossol, Monona. The Artist's Complete Health and Safety Guide. New York, NY : Allworth Press, 2001. The book is rather dated, updated information is available from her website.
Stats
Lightfastness
Poor
Not lightfast enough for us, as it is the low end of moderate to poor. May fall to BWS 3.
Transparency
Semi-Transparent
Toxicity
Thought to be category of lesser concern
Treat all pigments and paints with studio safety protocols.
Chemical Name
Disazo
Dry Pigments listing PO13
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