Isoindoline Yellow. Generally excellent to very good lightfastness (7’s and 8's for the Blue Wool Scale), however lightfastness is somewhere between decent and excellent. Sometimes made into a Permanent Yellow or even a Cadmium imitation hue. Tends to dry slowly. It's somewhat rare to find this pigment in a single-pigment paint in oil, however it shows up in a fair amount of warm marigold-colored blends, like Indian Yellow Hue.
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Isoindoline Yellow
PY139
Alternate Name
Paliotol Yellow
Pigment Description
Resources
PY139 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Information about PY139 from Bruce MacEvoy, Handprint Guide to Watercolors, General information about this class of pigments from Handprint,
Stats
Lightfastness
Excellent to Very Good
Some fall off in tints (7’s and 8’s)
Transparency
Semi-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
aminoketone, isoindoline
Dry Pigments listing PY139
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