The lightfastness may vary depending on the supplier, with some falloff in tints. However some sources report excellent lightfastness. This is a Disazo Condensation brown.
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Gubbio Red
PBr23
Pigment Description
Resources
PBr23 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
Excellent
May vary between very good and excellent depending on the pigment supplier. Some suppliers noted a slight-to-moderate fall-off in lightfastness. One supplier's version fell to a BWS 6.
Transparency
Semi-Transparent
Toxicity
Thought to be category of lesser concern
Treat all pigments and paints with studio safety protocols.
Chemical Name
Disazo Condensation
Dry Pigments listing PBr23
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