Secret of why jewel scarab beetles look like pure gold, explained by physicists.
University of Exeter physicists specialising in colour and light have done experiments exploring the origin of the scarab beetles' striking metallic golden appearance, showing that the golden beetles have a unique 'optical signature'. The structure of the beetle and its armour uniquely manipulates the way the light is reflected so that it looks like pure gold.
https://m.phys.org/news/2017-06-secret-jewel-scarab-beetles-pure.html
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