Shine a black light on a ripe banana with spots. Check out the area around the spots. Many plastics glow under black light. Often, you can tell a plastic is likely to glow just by looking at it.
For example, neon-colored acrylic may contain fluorescent molecules. Other types of plastic are less obvious. Plastic water bottles usually glow blue or violet under ultraviolet light.
White paper is treated with fluorescent compounds to help it appear brighter and therefore whiter. Sometimes forgery of historical documents can be detected by placing them under a black light to see whether or not they fluoresce.
White paper made post contains fluorescent chemicals while older paper doesn't. If you bought make-up or nail polish with the intention of getting it to glow under a black light, you knew what to expect.
However, you might want to check your regular makeup too, or next time you pass a bright fluorescent light emits UV or black light, the effect might be more "rave party" than "office professional. Hint: The bars at many restaurants have black lights to make drinks look pretty. If you have a jellyfish handy, see what it looks like under a black light in a darkened room.
Some of the proteins within a jellyfish are intensely fluorescent. Corals and some fish may be fluorescent. Many fungi glow in the dark. Some flowers are "ultraviolet" colored, which you cannot ordinarily see, but may observe when you shine a black light on them. Many more items glow when exposed to black or ultraviolet light. Here is a partial list of other materials that glow:. Actively scan device characteristics for identification. Use precise geolocation data.
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Select personalised ads. Apply market research to generate audience insights. Carefully mix the bleach in with the tonic. What happens when the bleach is added to the tonic? What happens after the bleach is mixed in with it? If you do not see a change in the tonic water, try adding and mixing in a few more drops of bleach. What happens? If you have some left, under the black light you can compare the glow of the tonic water in the original bottle with the tonic water that has bleach mixed in. Do they look very different?
Overall, how did adding bleach to the tonic water change its glow under the black light? Extra: If you dilute tonic water with regular water, you can make the tonic water glow less brightly.
What is the smallest amount of tonic needed as you dilute it with normal water for it to still visibly glow under an ultraviolet black light? Extra: Bleach is a type of chemical called an oxidizing agent. Some other common household oxidizing agents include hydrogen peroxide and OxiClean which contains sodium percarbonate. When other oxidizing agents are added to tonic water, do they have the same effect on its glow under an ultraviolet black light that bleach does?
Build a Cooler. Get smart. Sign up for our email newsletter. Sign Up. Support science journalism. Knowledge awaits. See Subscription Options Already a subscriber? Clear soft drinks typically appear to glow under a black light because the bubbles from the carbonation reflect back the visible portion of light from the lamp.
You can make any drink appear to glow by using glowing products:. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile.
Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Anne Marie Helmenstine, Ph.
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