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Art Spectrum® Dry Ground Pigment Aureolin.

Aureolin is a mid yellow cobalt compound that was introduced as an artist paint in 1852 by Saint-Evre, Paris.

A transparent synthetic inorganic pigment with very good lightfast properties. 

Series Colour Index Chemical Description Classification Opacity ASTM
4 PY40 Potassium Cobalt Nitrite Synthetic Inorganic Transparent ASTMII

ASTM Approved Permanent Colours American Society for Testing and Materials, conforming to standard D4302-90.