Where does this come from, and can I check it?

Ink cancellation marks log acceptance dates and void adhesive postal stamps. The figure is taken from USPS, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a everyday life fact?

Yes. It sits on the Everyday Life shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

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Postal postmarks cancel stamps to prevent reuse and log origin

Ink cancellation marks log acceptance dates and void adhesive postal stamps

Postal services apply ink postmarks across adhesive postage stamps when processing mail through sorting equipment. The black ink cancellation mark prevents stamps from being peeled off and reused, while recording the post office location, date, and time of acceptance into the mail stream.

Transfer office postal cancel Memphis — U.S. Post Office Department · Public domain · source

Where this comes from

USPS

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Tags: post office, stamps, mail

Postal postmarks cancel stamps to prevent reuse and log origin: the short answers

Where does this come from, and can I check it?: Ink cancellation marks log acceptance dates and void adhesive postal stamps. The figure is taken from USPS, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a everyday life fact?: Yes. It sits on the Everyday Life shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.