Naphthol Red Bright
PR22
Alternate Names
Naphthol Red Light
Naphthol Red Yellow Shade
Pigment Description
Naphthol Red Bright is one of several Napthols. Not recommended for artist's paints due to poor lightfastness. This dips into the bottom category of ASTM III, which is below the dividing line for even for other peoples' standards in paints. Thankfully we did not see it in oil, but we were shocked to see it in no less than 10 commonly available acrylics. However we mention it here as some artists combine oil and acrylic workflows in their paintings.
Another problematic red, we found a caution in Monona Rossol's research about potential serious health issues that could arise when this pigment is metabolized, as a derivative may create a carcinogen, so please consult her writing.
Resources
PR22 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
General information about this class of pigments from Handprint,
Rossol, Monona. The Artist's Complete Health and Safety Guide. New York, NY : Allworth Press, 2001. The book is rather dated, updated information is available from her website.
Stats
Lightfastness
Fair to Poor
Not lightfast enough for us, as it is the low end of moderate to poor. May fall to BWS 4. Shows appreciable change in both masstone and tints in outdoor exposures in Florida sunlight.
Transparency
Semi-Opaque, Opaque
Available in both semi-opaque and opaque versions.
Toxicity
Lower Concern
Low information. As with all pigments, treat all pigments and paints with studio safety protocols.
Chemical Name
Monoazo, also listed as Monoazo: 3-hyrdroxy-2-naphthanilide
C₂₄H₁₈N₄O₄
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