What is this close-up picture? (WotsThat: Crumpled aluminium foil)

Question

What object is shown in this zoomed-in close-up photo?

GranitePass · Accepted Answer

Crumpled aluminium foil. If you crumple aluminum foil into a ball and rub it on stainless steel or chrome, it actually polishes the surface and removes water spots and oxidation, making it shine like new. This works because the foil is softer than the metal underneath but hard enough to gently scrub away grime, and aluminum naturally reacts with oxidized surfaces to restore their shine.

Answer: Crumpled aluminium foil

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