Decent to excellent lightfastness with some fading in tints. A variety of Cobalt Blue Deep. Like all cobalts it has toxicity, and it is rated at "B" so handle with extra care and proper precautions.
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Cobalt Zinc Aluminate Blue
PB72
Alternate Names
Cobalt Blue Deep
Cobalt Blue Dark
Pigment Description
Resources
PB72 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Information about PB72 from Bruce MacEvoy, Handprint Guide to Watercolors,
Stats
Lightfastness
Excellent
Excellent but may fade in tints (8’s and 7’s on BWS). See also Golden’s (lightfastness testing)[https://justpaint.org/astm-lightfastness-testing-for-oil-paints/] for Cobalt Blue Deep PB74. There may be a bit more variability in lightfastness than was once thought.
Transparency
Semi-Transparent
Toxicity
Hazard, Use more caution
Hazardous, contains cobalt. Monona Rossol has information on cobalt pigments available through her site as well as the Artist's Guide to Health and Safety. CAMEO also comments on some of the toxic effects of cobalt. We are not toxicologists nor safety experts so please consult the relevant authorities and also SDS. Treat all pigments and paints with studio safety protocols.
Particle Size
Fine
Chemical Name
Cobalt Zinc Aluminate Blue Spinel
Dry Pigments listing PB72
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