What is this close-up picture? (WotsThat: Matchbox strike surface)

Question

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

GlaucousRift · Accepted Answer

Matchbox strike surface. Matchbox Strike Surface Fun Fact The red phosphorus coating on a matchbox strike surface was originally invented as a safety feature to prevent matches from igniting spontaneously—but it also makes the striking surface gradually wear down, which is actually why matchboxes have that rough, textured appearance that gets smoother over time. This clever design means old matchboxes literally become less effective the more you use them, essentially built-in obsolescence from over a century ago!

Answer: Matchbox strike surface

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