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The bright yellow paint these artists used was made from the chemical compound cadmium sulfide.

The government contends the zinc cadmium sulfide sprayed to simulate what would happen in a biological weapons attack was harmless.

While studying the new element, he ended up creating the bright yellow solid cadmium sulfide, remarking that it “promises to be useful in painting.”

This new understanding of the artwork may inform the preservation of other paintings by Munch’s contemporaries, such as Matisse and van Gogh, which also contain decaying cadmium sulfide pigments.

Over time, with exposure, the yellow cadmium sulfide has oxidized into two white chemical compounds, cadmium sulfate and cadmium carbonate.