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

Shaping wet paper pulp thickness creates embedded images visible under light. 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.

Mondo Knows Facts

Banknote watermarks are formed by altering paper fibre density

Shaping wet paper pulp thickness creates embedded images visible under light

Genuine banknote watermarks are not printed with chemical inks. They are created during wet paper manufacturing by pressing a dandy roll with raised metal wire designs onto wet pulp, varying paper fibre thickness so light shines through detailed images when held up to light.

Where this comes from

USPS

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Tags: currency, money, paper

Banknote watermarks are formed by altering paper fibre density: the short answers

Where does this come from, and can I check it?: Shaping wet paper pulp thickness creates embedded images visible under light. 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.