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Phosphor
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===Postage stamps=== [[Phosphor banded stamp]]s first appeared in 1959 as guides for machines to sort mail.<ref>[http://www.stamp-shop.com/dummies/see-phosphor.html SEEING PHOSPHOR BANDS on U.K. STAMPS] {{webarchive|url=https://web.archive.org/web/20151019005044/http://www.stamp-shop.com/dummies/see-phosphor.html |date=2015-10-19 }}.</ref> Around the world many varieties exist with different amounts of banding.<ref>[http://www.gbmachins.co.uk/html/phosphor_bands.html Phosphor Bands] {{webarchive|url=https://web.archive.org/web/20170317231538/http://gbmachins.co.uk/html/phosphor_bands.html |date=2017-03-17 }}.</ref> [[Postage stamp]]s are sometimes collected by whether or not they are [[Tagging (stamp)|"tagged"]] with phosphor (or printed on [[luminescent]] paper).
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