https://arstechnica.com/science/2023/05/heres-what-caused-black-stains-on-leonardo-da-vincis-codex-atlanticus/
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5/2/23 at 8:07pm
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Ars Technica
Author
Jennifer Ouellette
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The culprit: nanoparticles of metacinnabar, a mercury sulphide black crystalline phase.
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