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    Benzimidazolone Maroon

    PR175

    Alternate Name

    Benzimidazolone Red HFT

    Pigment Description

    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.

    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

    Transparent, Varies

    In oil, we have found a version that is listed as opaque, while it seems to be transparent in watercolor.

    Toxicity

    Lower Concern

    Treat all pigments and paints with studio safety protocols.

    Chemical Name

    monoazo, 3-hydroxy-naphthanilide

    with PR175 (Benzimidazolone Maroon)
    No single-pigment Oil found with PR175

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