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What is patina?

patina
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What is patina?

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• A patina refers to the smooth sheen that is produced by the aging and use of natural stone over time.

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Patina is the layer of zinc hydroxycarbonate that forms on the surface of the zinc when it is exposed, in the presence of water, to the oxygen (O2) and carbon dioxide (CO2) in the air. The patina consists of a compact protective layer, which adheres to the zinc beneath it in rainwater and protects the zinc from any later atmospheric corrosion.

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