Oxidization of Gold and silver

‘Oxidization/Oxidation of metal’, commonly known as ‘Tarnishing’, is the slight corrosion of the metal surface, causing the discoloration or blackening of a piece of jewelry. This is a natural process where the metal interacts with sulphur-bearing pollutants in the environment, to create a sulphide layer over its surface, resulting in the visible discoloration. This is an ongoing problem for jewellers, particularly for silver and low carat gold articles.

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