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Art Spectrum® Dry Ground Pigment Viridian.

A cool blue-green pigment made of hydrated chromium oxide.

Viewed under a microscope, Viridian pigment particles look similar to fragments of Emerald gemstone.

A transparent synthetic inorganic pigment with excellent lightfast properties.

Series Colour Index Chemical Description Classification Opacity ASTM
4 PG18 Hydrated Chromium Hydroxide Synthetic Inorganic Transparent ASTMI

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