Benzimidazolone Orange HGL
PO60
Alternate Name
Hostaperm Orange
Pigment Description
This is a hard to find pigment which is used mostly in industrial applications, described as a reddish orange. Slow drying but excellent lightfastness. Monona Rossol mentions that it may metabolize to an aniline (may also cause health impacts such as cancer— so please do your own research). See her writing for more information. As a bright clear orange which is nearly in the transparent category, its abilities in glazing have been noted.
Resources
PO60 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
General information about this class of pigments from Handprint,
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
Excellent
This pigment is not rated by the ASTM, but it has solid highest marks on the blue wool scale tests. The 1980s NPIRI does not list any outdoor tests, but on indoor tests it performed well.
Transparency
Transparent
Toxicity
Previously thought to be in the Lower Concern category, however it may be similar to anilines, some of which can cause cancer.
See Monona Rossol's research available upon request here for more information. Treat all pigments and paints with studio safety protocols.
Dry Time
Slow
Chemical Name
monoazo, acetoacetyl, HGL, benzimidazolone
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