20200521_F0001: Exploding colours and patterns on a tiny gold bead

wfxue posted a photo:

20200521_F0001: Exploding colours and patterns on a tiny gold bead

– This is a very small part of a gold jewellery. With my inverted lens set up, the chromatic aberrations give lots of interesting colour effects. But I don’t know exactly why the small golden surface gives interesting branching patterns as you can see. Is it the surface roughness?

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