Why Doesn’t Gold Tarnish?



Why doesn’t gold tarnish? A simple answer might be that it’s a so-called “noble metal”—its atoms don’t like to chemically react with others. But a more complex answer also answers *why* gold atoms are so unreactive. Some of it is due to special relativity, and some is due to a phenomenon called reconstruction.

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24 Comments

  1. Not sure how Matt Parker is gonna feel about this news. I feel like everyone is going to be bombarding the science and math world with “hexagons are bestagons” again and man, Matt Parker hates that phrase. It makes him physically groan. It’s amusing.

  2. Claim checked: gold's yellow color is literally a relativity artifact. Its 6s electrons orbit at ~half light speed, which contracts those orbitals and opens the 5d-6s gap so gold absorbs blue light. Take relativity away and gold would look like silver. Inert + Einstein = zero tarnish.

  3. Some tarnishes can occasionally be more than meets the eyes, some of them are spontaneously generated ceramic layers due to oxidation, like what's on Aluminum metal, that better resists further chemical attacks that you gotta intentionally scratch or rub into it with Mercury or Gallium in order to attack it directly, some acids can remove that protective ceramic rust layer though. Rusts has so many and diverse interesting properties which some are more protective than destructive. In fact anodization is technically a controlled rusting process that puts on durable ceramic layers on Titanium and Aluminum.

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