I bought the blacklight originally for stamps. There are a few varieties from when they started making them flourescent for the facing/cancelling machines. Plus errors where they left the tagging off.
I've found lots of uses for it since then.
The old one did both short and long wave, I don't think the new one does. But the new one is much less expensive. The old one was something like $60 back in the 80's.
Steve B
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