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Naphthol AS-TR

PR7

Alternate Names

Permanent Red

Permanent Carmine

Pigment Description

This color is probably not sufficiently lightfast for use in artist materials. It makes it onto several of the "not suitable" lists, namely for watercolor and gouache. It is somewhat surprising to see the ASTM I listing for oils. Naphthols in general have problems with fading in tints.

Resources

PR7 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com

General information about this class of pigments from Handprint

Dry Pigments listing PR7

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