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UV-Test |
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| In
the 1960ties, photographic papers were produced with optical brighteners,
to make the photo look brighter and to save the photos of getting "brown"
after some time.
This effect can be made visible with a blacklight lamp. |
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Comparison of two Leonar papers, both from the 1960ties |
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Interesting effect on this Leonar paper: Obviously this paper has adopted the "brightener" from a newer paper which was stored together. |
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