Which specific pigment, favored by Van Gogh for his vibrant sunflowers, has chemically darkened over time?
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Van Gogh made extensive use of chrome yellow, a relatively new pigment in the 19th century. Unfortunately, chemical reactions triggered by sunlight cause this lead-based pigment to degrade and turn a dull brown over time. Modern museums use specialized LED lighting to slow down this inevitable fading process.
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Source: Wikipedia (CC BY-SA)
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