I bought three last weekend as well. I think the UV in a black light or in those cups are a different type of light because the glow effect was not as intense as I’ve seen from others. The set up is definitely well done though.
I just bought one of these boxes from princess auto. took a new flasher that has been in a box in the dark and ran it through a cycle. then took it into a dark room and it barely glowed. held the same flasher under a regular ceiling light for a minute then back into the dark room and it glowed much better. Not sure if this thing actually works
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