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Here’s what caused black stains on Leonardo da Vinci’s Codex Atlanticus

Summary by Ground News
Black stains on a folio of Leonardo da Vinci's Codex Atlanticus confirmed the presence of starch and vinyl glues in the affected areas. The glues were most likely applied during an earlier restoration effort some 50 years ago. Researchers identified a likely cause of the dark stains: nanoparticles of a mercury sulphide called metacinnabar in the protective paper holding the folio.

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Ars TechnicaArs Technica
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Here’s what caused black stains on Leonardo da Vinci’s Codex Atlanticus

The culprit: nanoparticles of metacinnabar, a mercury sulphide black crystalline phase.

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Ars Technica broke the news in United States on Tuesday, May 2, 2023.
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