why do things glow under black light

Do you like to? How about? Did you know that both of those activities can be way more
if you do them in the dark under a black light? When that happens, you're set for some! Whether you've been glow or experienced the glow-in-the-dark effects of a black light at a skating or an amusement park, you know what a cool and sensation it is to see your clothing glow like it's. What's going on here? Are black lights? Nope! They're simple tools that take advantage of science. Let's take a closer look at black lights and why they make things glow. Black lights are made in much the same way that regular or lights are made. The primary difference is in the, coatings, or filters that are used in black lights. Black lights use these different materials so that most of the light emitted is ultraviolet (UV) light with just a bit of light in the wavelengths closest to the UV ( and violet). That's why black lights usually appear dark blue or purple. Ultraviolet light can't be detected by the naked eye. We're surrounded by UV light every day when we enjoy the rays of the Sun.


Although UV light has some applications, we must be careful to avoid, which can lead to increased risk of, eye damage, and skin aging. When UV light bounces off objects that contain special substances called phosphors, interesting things happen. Phosphors are substances that emit light in response to radiation. Phosphors hit by UV light become excited and naturally fluoresce, or in other words, glow. In addition, although your eyes can't see the UV light as it leaves the black light, some of that UV light that gets reflected back to your eyes after hitting the phosphors now has less energy and falls within the range. These factors combine to produce the glow-in-the-dark effects you're familiar with. There all sorts of phosphors, both natural and man-made. For example, your teeth and fingernails contain phosphors, which explains why they glow under a black light. There are also many man-made phosphors found in fabrics, paints, and building materials. That's why certain clothing and objects look so cool under a black light.


Black lights have many practical applications beyond simply having while, dancing, or roller skating. Forensic experts, for example, can use black lights to examine crime scenes for evidence of bodily fluids, such as blood. Law enforcement officers can use black lights to identify counterfeit money, as well as forgeries of antiques and artwork. Ultraviolet light creates some really strange and beautiful glows from all kinds of surfaces, yet not everything lights up. So, why does UV light make things glow? Starting with the basics, typical household ultraviolet lights, whether tube, bulb or LED, all emit light that falls into the part of the electromagnetic spectrum next to the visible (400-700nm)б section called ultraviolet. You can see the UV region just left of the blacked out visible section in the diagram below: Black light is what is usually emitted from non-commercial, household UV devices. Lights such as these perform a wide range of really useful functions such as locating hidden pet stains, producing super visuals at UV parties, or detecting counterfeit bank notes.


Black lights are readily available because they re quite safe, being longer in wavelength than the much more damaging shorter wavelengths of 320nm and below. Black light, so called because of its dull, low visible light emission, is a sub-section of UV light, residing in the upper/longer wavelength end of the UV range. This range of light is known as UVA, and falls within what is known as near ultraviolet. The complete range of UV light classifications (some overlap! ) can be seen below: The glow that you see when you shine UV light over a surface comes from phosphors. Phosphors are substances, typically with a strong/rigid atomic structure and prevalence of delocalized (see this URL for an in-depth explanation:б )б electrons, that emit light when exposed to radiation. In this case, the light from phosphorescence is in the visible part of the electromagnetic spectrum. Below is an example of phosphorescence from a home mineral display: Energy from UV light is initially absorbed by electrons in these phosphors, forcing some electrons to jump into new, farther out and much more unstable orbits around the atomic nuclei they re part of.


Whilst in these faster, more furious, energy rich orbits some energy starts to escape them, cooling and slowing down their pace. This cooling eventually forces the electrons to fall back into their original, more stable orbits. It is primarily this sudden fall back into the electron s normal, more stable orbit that results in the glows that you see. As the electron falls into its usual orbit (or electron shell, see:б ) it gives off the remaining energy it had originally absorbed from the UV light, in the form of lower energy/higher wavelength, visible light. So there you go, a nice and not too technical explanation on how UV causes fluorescence! As always, be sure to pass by our frequently updated blog for the latest and greatest UV information, and indeed the most up-to-date urine eradication systems and technologies!

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