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Ultramarine Blue Deep (P307G)
ACMI Tox Rating: AP
CI Name: PB29
Chemical Description: Complex Silicate of Sodium and Aluminum with Sulfur
Lightfast Rating: I
Opacity: T
Description: One of the three ultramarines offered by Grumbacher, this vibrant blue is an essential of any artist's palette. A deep blue with a red undertone, it can be mixed extensively to produce clean secondary and tertiary colors. It is a staple for shadows, portraits, landscapes, and seascapes. It is slightly deeper than the other ultramarines.
reference: www.grumbacherart.com