Naphthol Red DK
PR5
Alternate Names
Naphthol ITR
Permanent Red
Permanent Carmine
Napthol Carmine FB
Pigment Description
Naphthol Red DK. (One of several Napthol reds). Moderate to inadequate lightfastness. We were surprised to see this color found in a currently available Cadmium Red Imitation hue by a major art supplier, and they listed good lightfastness. Perhaps they found a better source for the pigment, but it might be worth doing one's own lightfastness tests.
This is another case where Monona Rossol's work about potential serious health issues that could arise, such as methemoglobinemia, so please consult her writing on pigments.
Resources
PR5 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
Moderate to Poor
Does not hold lightfastness in tints. Lightfastness may vary depending on differences in the pigment’s manufacture. This pigment has been known to fade to a BWS 5 in tints which is too low for us. Some sources describe appreciable fading in tints after one year in Florida sunlight. Other sources list it as ASTM II (very good) in some media, but we would consider 5’s on the BWS to be too low for archival artwork. Lightfastness may be lower in watercolor.
Transparency
Semi-Transparent
May also be described as Semi-Opaque, sources vary but it seems to be closer to semi-transparent
Toxicity
Lower Concern
Source: artiscreation.com. Like most pigments, avoid the dust and always handle with care just in case.
Chemical Name
Monoazo, 3-hydroxy-2-naphthanilide, ITR
C₃₀H₃₁ClN₄O₇S
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