jackson pollock manganese blue 1234752350

A scientific paper published in PNAS reveals that Jackson Pollock's 1948 masterpiece *Number 1A* contains an extinct variety of manganese blue paint. Using Raman spectroscopy, researchers from Stanford University, City College of New York, and MoMA's conservation department identified the synthetic pigment, which was popular in the 20th century but phased out in the 1990s due to environmental concerns.