Natural Indigo, from Indigofera tinctoria or Baphicacanthus cusia. This is thought to be fugitive (about ASTM III). We were saddened and surprised to learn that natural indigo can actually be quite toxic. See Monona Rossol's research for more.
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Natural Indigo
NB1
Pigment Description
Resources
NB1 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.comCAMEO Materials Database: Conservation & Art Materials Encyclopedia Online, Museum of Fine Arts Boston. (Accessed June 2043). Indigo https://cameo.mfa.org/wiki/Indigo. Museum of Fine Arts Boston,
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
Fair-Poor
Not lightfast, may vary
Transparency
Transparent
Toxicity
Thought to be in the category of Lower Concern but may have some hazards
Natural indigo may be more toxic than was once thought. See Monona Rossol's research for more. Treat all pigments and paints with studio safety protocols.
Dry Time
Slow
Dry Pigments listing NB1
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