05/29/2026
Gold looks yellow because relativity changes how its electrons handle light.
The heavy gold nucleus pulls some electrons so strongly that their energy levels shift, making the atom absorb blue and violet light more easily.
Silver sits above gold on the periodic table, but its electrons do not shift the same way, so it reflects visible light more evenly.
Interesting Things with JC 1667: "Gold’s Color Comes from Relativity"
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