Chrome yellow

I came across this article about the chrome yellow that Impressionist artists especially Van Gogh used in their paintings. The colour was not only toxic put when exposed to ultraviolet light world darken overtime which explains why some of the Sunflowers by Van Gogh have turned brown. Although in the late 19th century more colours became available to artists the scientists who developed them had not undertaken exhaustive tests as they would today to ensure that they where safe to use and would be lightfast over time.

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