Isoindolol Orange, also known as Irgazin® Orange L. This color has moderate to excellent lightfastness depending on the pigment supplier, so one may wish to do one's own lightfastness testing. It's offered by one paintmaker in oil and acrylic, and turns up in a few blends in watercolor.
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Isoindolol Orange
PO61
Alternate Names
Isoindoline Orange
Chromophal Orange
Pigment Description
Resources
PO61 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
General information about this class of pigments from Handprint,
Stats
Lightfastness
Varies depending on manufacturer
Not rated by the ASTM but likely somewhere between I and II. Some varieties show blue wool ratings that could be said to be closer to excellent (BWS 8) with a slight drop off (BWS 7) in tints, while other pigment suppliers have scores that fall closer to moderately poor lightfastness (BWS 5).
Transparency
Transparent
Toxicity
Thought to be in the category of Lower Concern
Treat all pigments and paints with studio safety protocols.
Dry Time
Slow
Chemical Name
Tetrachloro-isoindolinone
Dry Pigments listing PO61
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