What types of powders show up very brightly under a UV light? I am working on a theft detection issue, but commercial powder products are very overpriced and hard to find without mail order. I was hoping there was something mundane to be used instead. Note: inks and liquids will not work for my situation.What powder substances luminece under a Black Light?
Laundry detergent powder often fluoresces a bright white/blue. Glow-in-the-dark powder is a bit more expensive, but very bright (and available in many colors). There are also many minerals that do this, but they are usually uncommon enough to be too expensive for such a use.
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