You don't have to be into expensive stuff to want/need a black light. It's one tool in your bag of tricks to detect *some* fakes/reprints. I use it mostly to determine whether photos are possibly restrikes / reprints.
One thing to remember. If paper glows it was likely produced after 1939. If it does not glow, you don't know when it was produced as some newer paper products do not have optical whiteners. Also remember that fakes/reprints can be created with old paper stock that was produced before 1940 and will not glow.
jeff
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