Optical brightener
Stilbene-based fluorescent whitening agent added to paper from the early 1950s onwards; under 365 nm UV the paper glows bluish white. A clear absence narrows the paper to pre-1950 manufacture.
Stilbene-based fluorescent whitening agent added to paper from the early 1950s onwards; under 365 nm UV the paper glows bluish white. A clear absence narrows the paper to pre-1950 manufacture.
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