The chemicals that fluoresce were added to paper in the WWII era, and to photopaper in 1955.
As mentioned, if a supposedly Pre-WWII item does not fluoresce, that does not prove it old, because some modern paper and cardstock do not have the chemicals. However, the lack of fluorescence is consistent with it being old-- a good sign and helpful evidence.
Last edited by drcy; 02-16-2018 at 09:44 AM.
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