Hansa Orange RN
PO5
Alternate Names
Dinitraniline Orange
DNA Orange
Permanent Orange 2G
Pigment Description
Sometimes labeled Permanent Orange, unfortunately it is not permanent at all, and has moderate lightfastness. It's currently offered in oils by two paintmakers. Sometimes the blue wool ratings show fading as bad as 4 in tints, and even the better versions are still looking at 5's and 6's.
This article mentions its opacity and weatherfastness, but apparently the weatherfastness does not translate to high enough lightfastness ratings for serious artwork.
As far as health impacts, in her latest work, found via her site Monona Rossol mentions that this is listed as a carcinogen and also has toxic impurities.
Resources
PO5 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Information about PO5 from Bruce MacEvoy, Handprint Guide to Watercolors, 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
Transparency
Semi-Opaque, Opaque
Some versions are opaque. The NPIRI notes that the opaque versions are similar to PR104
Toxicity
Potential Hazard, possibly toxic
According to Monona Rossol, PO5 is a mutagen which is also listed as a carcinogen based on structure. It also contains toxic impurities. Please refer to her most recent work available by request here. Treat all pigments and paints with studio safety protocols.
Chemical Name
monoazo, acetoacetyl (SM)
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