Diarylide Yellow H10G
PY81
Pigment Description
This is a lemon yellow that is fairly rare in oils. Known as Diarylide Yellow H10G. It has an ASTM LF rating of II. For some reason it is not found as a single-pigment yellow in oils but for some reason it seems to be more frequently blended with titanium white into a convenience blend to make colors like Lemon Yellow, Permanent Yellow Pale and Titanium Yellow. There is at least one single-pigment paint in watercolors.
Resources
PY81 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Stats
Lightfastness
Fair or Good but not Excellent
The NPIRI Raw Materials Data Handbook from the 1980s reports only indoor testing for this pigment, however it describes the fading in tints as “appreciable.” Some sources, such as artiscreation, list ASTM II, Very Good.
Transparency
Semi-Transparent, Semi-Opaque
Toxicity
Previously though to be Lower Concern, however it may be contaminated with toxic PCBs.
In the 1980s the NPIRI noted that PY81 may be contaminated with trace amounts of PCBs.
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