What is this close-up picture? (WotsThat: Matchstick head (macro))

Question

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

ChrysotileRun · Accepted Answer

Matchstick head (macro). The red coating on matchstick heads contains glass powder, which acts like tiny shards of sandpaper that generate heat through friction when struck against the box — meaning matches literally work by creating controlled microscopic scratches rather than igniting from a spark. Some match manufacturers use powdered glass so fine that it's invisible to the naked eye, making the chemistry of a simple match surprisingly sophisticated.

Answer: Matchstick head (macro)

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