NEW YORK (AP) — Scientists have identified the origins of the blue color in one of with a little help from chemistry, confirming for the first time that the abstract expressionist used a vibrant, synthetic pigment known as manganese blue.

“Number 1A, 1948,” showcases : paint has been dripped and splattered across the canvas, creating a vivid, multicolored work. Pollock even gave the piece a personal touch, adding his handprints near the top.

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