This is listed as ASTM II, so that is a bit lower than we like to see.
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Pigment Red 221
PR221
Pigment Description
Resources
PR221 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
Estimated ASTM II - Very Good
Estimated equivalency of ASTM II Very Good, however if this color is part of your workflow you may want to seek out additional data from Blue Wool Scales or manufacturer testing
Transparency
Transparent
Toxicity
Thought to be category of lesser concern
Treat all pigments and paints with studio safety protocols.
Chemical Name
Condensed Disazo
Dry Pigments listing PR221
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