martynball

?

Money has marking on it that glows under UV light, as do other forms of identification. For some reason the UV LED's I have do not cause the marking on money to glow, but it does on a driving license. Also, cocaine does glow under a certain wave length, of course I don't have any to test my led's on so I was wondering if anyone knew if my LED's would work. And of course i'm not talking about visible blood, but blood that has been attempted to wash up, like they do in crime scene's although they use some spray to amplify the effect.

How active is this forum?

Hey, i'm no expert in science so I don't know what category light comes under. But here is a question I asked on Yahoo Answers but i'm not getting a reply, plus there answers aren't always trustworthy. I need a LED torch that will show drugs + blood. Currently I have one which shows the security markings on UK driving licenses which according to Wiki is: 230-365 nm: UV-ID, label tracking, barcodes For some reason this does not show the markings on UK notes, like it should do, i'm guessing money needs a different wavelength? Now according to the same wiki page to see blood + drugs you need the following wavelength: 200-400 nm: Forensic analysis, drug detection So my current one that should be between 230 - 365 is it works on driving licenses, should work on blood? It's between 200 - 400nm :S