12/18/2023 0 Comments Stuff that glows under black lightWhite bobbin threads on the reverse glow more violet on the repros, while the natural fibers often have a softer yellowish glow. So is it a mostly poly patch with nylon merrowing or an earlier patch with the merrowing added? (Not sure what the patch actually is as I don't really collect the newer stuff, maybe somebody could enlighten me?) :dunno: What really threw me here was a merrowed edge patch that I have that's all white background reversed color Caribbean Defense Command /Jungle Expert design patch that only seems to glow on the merrowed edge. Then of course there is the fact that phospher brighteners in some detergeants can make a good patch glow violet, just check out your white cotton T-shirt with a black light, that's why it glows unless you use a brightener free detergeant. The white threads seems to stand out and glow really violet on some of the newer patches, but just shows mostly white on the older. What general dates are we looking at for glowing and non-glowing materials?Īlso what Nm range in a UV light gives the best effect without giving a false glow or is there much difference?įrom what I can tell by comparing old and newer patches, oranges and yellows stand out brightly on the rayon and cotton AND the synthetics patches, but the synthetics look more like fluorescent orange. I read somewhere that polyester thread doesn't glow, so what periods and materials are we helping to eliminate with the test? Of course the UV light is just a tool and not a definative proof of a patch's age. On the previous link it says, I think incorrectly, that Rayon will glow under UV, but I think they meant Nylon. I found a very vague and general outline outside the forums here: Rocks, jewels and gemstones – lots of minerals glow under UV lightĭuring the initial lockdowns of 2020, some chemists even published an editorial in Matter on other objects in their kitchen they could get to glow.īut the list doesn’t stop there.Is there a guide for using a UV blacklight in the forums, maybe with some examples or pictures of how synthetic fibers look when they glow?.Eggs – a compound in eggshells called protoporphyrin IX can glow red.Turmeric root – the curcumin in turmeric glows yellow.Honey – the aromatic molecules in honey can glow green.Tonic water – the quinine in tonic water glows blue.Here are a few things you might have in your house with that glow under UV: Plenty of other stuff has photoluminescent chemicals in it. Credit: Science Photo Library / Getty Images Tonic water picks up a blue tone under UV. A substance, like the little lines of chemicals on your RAT, can absorb invisible UV light, and then shine out green or yellow light. What this means in practice is that light of one colour can be return as another colour. When a photon hits a substance, it can be absorbed and then released again at a different (usually lower) level of energy. The photons in UV light are travelling at a slightly faster wavelength than those in violet light (hence the term ‘ultra-violet’). Ultraviolet light is exactly the same stuff as visible light – it’s just got slightly more energy. There are at least half a dozen things in your home that glow or change colour under UV light – some quite dramatically. Or, at least, something fun to do for an hour while you’re in isolation. If you’ve been using rapid antigen tests a lot over the past few months, it’s possible you now have a number of UV torches in your possession.ĭon’t chuck them out – the torches, which come with some (but not all) RATs, could lead you to an important scientific discovery.
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