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Dry Ground Pigment - Art Spectrum
A colourful history of pigments
Cobalt glass ingots from the Ulu Burun shipwreck (late 14th c
Pigments through the Ages - Overview - Cobalt blue
Blue pigments - Wikipedia
Pigment Colour Index: Blue Pigments - Jackson's Art Blog
Cobalt Blue (PB28) - Erik Lundgren Watercolor
Pigment Colour Index: Green Pigments - Jackson's Art Blog
Introducing The Encaustic Painter's Dozen: A Limited Edition Set