This incredible, mysterious pale blue may be among the oldest synthetic pigments. It is similar to Han Blue. One of it curious properties is it can emit infrared light when green or red light is shone onto it.
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Egyptian Blue Pigment
PB31
Alternate Names
Blue Frit
Copper Frit
Copper Calcium Silicate
Pigment Description
Resources
PB31 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). [Azurite](https://cameo.mfa.org/wiki/Azurite, https://cameo.mfa.org/wiki/Blue_bice, https://www.kremer-pigmente.com/elements/resources/products/_files/10201-10208e.pdf) https://cameo.mfa.org/wiki/Azurite. Museum of Fine Arts Boston.
Stats
Lightfastness
Sources disagree
On Artiscreation, listed as estimated ASTM II Very Good. Not tested by the ASTM, but Natural Pigments writes, "It is completely light fast".
Toxicity
Possible Hazard, Use more caution
Treat all pigments and paints with studio safety protocols.
Tinting
Low
Oil Content
Low/Lean
Not compatible with oil
Particle Size
Fine
Chemical Name
Copper Calcium Silicate
CaCuSi₄O₁₀ or CaOCuO(SiO₂)₄
Dry Pigments listing PB31
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