What is this close-up picture? (WotsThat: Rust metal texture (macro))

Question

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

CerussiteX · Accepted Answer

Rust metal texture (macro). Rust is the common name for iron oxide, which forms when iron reacts with oxygen and moisture; unlike the protective oxide layer some metals form, rust flakes off and keeps exposing fresh metal to corrode.

Answer: Rust metal texture (macro)

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