Scientists Finally Solve the Mystery of Why Gold Never Tarnishes

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Tulane simulations show reconstructed gold surfaces drastically slow oxygen reactions, helping explain gold’s remarkable resistance to tarnish.

Gold Is Naturally a Noble Metal

Researchers Examined Gold at the Atomic Level

Not Every Gold Surface Is Arranged Identically

The Surface Atoms Reorganise Themselves

Oxygen Must Split Before Oxidation Begins

Hexagonal Geometry Creates the Strongest Defence

The Slowdown Is Enormous

Gold Might Oxidise Without This Rearrangement

The Discovery Could Improve Gold Catalysts

“Never Tarnishes” Still Needs Qualification

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Gold has preserved its distinctive shine in jewellery, coins and historical objects for centuries, resisting the surface damage that quickly changes metals such as iron, copper and silver. Scientists traditionally attributed this durability mainly to gold’s weak chemical interaction with oxygen.

New research from Tulane University reveals another powerful defence. Computer simulations indicate that atoms on common gold surfaces rearrange themselves into patterns that make oxygen reactions up to a trillion times slower.

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