Toluidine Red

PR3

Alternate Names

Studio Red

Hansa Red

Segnale Red

Pigment Description

This abominable color has a blue wool scale of 3/8 (about ASTM IV category). If you are new to this, the way it works is higher the blue wool scale on a scale of 1-8 the better- eight is the best. For us, sevens mean moderate. Sixes are lower than we would use. A three for lightfastness is quite low.

Toluidine Red comes in three different varieties, light, medium and dark.

In terms of health, Monona Rossol also writes that it may be a carcinogen as well as about potential serious health issues that could arise, so please consult her writing if you choose to use it.

Resources

PR3 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com

Information about PR3 from Bruce MacEvoy, Handprint Guide to Watercolors, General information about this class of pigments from Handprint, More 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

Unclear, likely Poor

For us ASTM III is too low. May range from II to IV but the figures on Artiscreation are estimated. One BWS test reported shows fading to a 3.

Transparency

Semi-Opaque

Toxicity

Previously thought to be in the category of Low Concern, new research suggests this may be a carcinogen.

See Monona Rossol's research available upon request here for more information. This pigment may cause methemoglobinemia, and it may be a carcinogen. Treat all pigments and paints with studio safety protocols.

Oil Content

Varies from moderately low to high

May be on the higher end of moderate. Depends on formulation. By weight, Artiscreation lists approximately 40g/100g of oil, but your pigment may have different requirements.

Chemical Name

Monoazo, 2-naphthol

Dry Pigments listing PR3

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