Opinions are divided on the lightfastness of this pigment. It ranges pretty widely. We were very surprised to learn that indigo may be extremely toxic-- see notes below on natural indigo as well. Please see Monona Rossol's work as her writing contains details and information on this important topic. We have not personally worked with this as a painting pigment, but have encountered indigo dye in other arts projects.
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Indigo
PB66
Alternate Name
Indigofera
Pigment Description
Resources
PB66 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com,
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
Varies
Varies considerably, perhaps down to ASTM III, which is not very good.
Transparency
Semi-Transparent
Toxicity
Thought to be category of lesser concern
Treat all pigments and paints with studio safety protocols.
Chemical Name
Synthetic indigo, indigoid
Dry Pigments listing PB66
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