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

Question

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

CastIronDave · Accepted Answer

Eraser surface. Erasers weren't invented until the late 1700s when a Brazilian rubber tree was discovered to remove pencil marks. Before that, people used bread crumbs or pumice stone to correct their writing mistakes.

Answer: Eraser surface

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