Sometimes called Benzimidazolone Red. The lightfastness is reported to be good, though it may loose just a little in tints depending on the pigment supplier.
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Benzimidazolone Maroon
PR175
Alternate Name
Benzimidazolone Red HFT
Pigment Description
Resources
PR175 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Information about PR175 from Bruce MacEvoy, Handprint Guide to Watercolors, General information about this class of pigments from Handprint, More from [Handprint](Could add PR171)
Material Archiv, Stefan Muntwyler and Georg Kremer (2010). Purpurrot bräunlich PR 175 https://materialarchiv.ch/de/ma:material_1079?type=all&n=Grundlagen. Material Archiv.
Stats
Lightfastness
Excellent, some varieties may fade a bit in tints
Mostly ASTM I. Excellent depending on supplier. One variety shows the highest marks (BWS 8) while another shows a slight drop off in tints (BWS 7).
Transparency
Varies
In oil, we have found a version that is listed as opaque, while it seems to be transparent in watercolor.
Toxicity
Thought to be in the category of Lower Concern
Treat all pigments and paints with studio safety protocols.
Chemical Name
monoazo, 3-hydroxy-naphthanilide
Dry Pigments listing PR175
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