Egyptian Blue Pigment
PB31
Alternate Names
Blue Frit
Copper Frit
Copper Calcium Silicate
Pigment Description
This incredible, mysterious pale blue may be among the oldest synthetic pigments, and it is similar to Han Blue. The methods for its manufacture were rediscovered in modern times. One of its curious properties is that it can emit infrared light when green or red light is shone onto it.
This fascinating historical blue was produced in Ancient Egypt. Sky blue pigments are somewhat rare, and this one was made by heating various elements to over 1500 degrees F (1526 degrees to be exact, or 830 degrees celcius, though other sources suggest even higher temperatures).
Closeup Egyptian Blue, PB31 pigment from Natural Pigments
We've heard Egyptian Blue doesn't make the best oil paint, and was more popular in watercolor. Interestingly it comes in shades from a deep blue to a light blue. Even the samples we've purchased vary a bit in color.
Two bottles of Egyptian Blue, both from Natural Pigments
In terms of toxicity, it may contain free silica, so do not breathe the dust and consult the proper experts for proper gear and safe handling of the dry pigment.
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
More information may be found at artiscreation.com. Contains copper. Monona Rossol’s work has some information on the hazards associated with copper-containing pigments.
Tinting
Low
Oil Content
Low/Lean
Not compatible with oil
Particle Size
Fine
Chemical Name
Copper Calcium Silicate
CaCuSi₄O₁₀ or CaOCuO(SiO₂)₄
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