Many more items glow when exposed to black or ultraviolet. Here is a partial list of other materials that glow: 

Petroleum jelly such as Vaseline, glows a bright blue color under a fluorescent light. And also: 

Rock salt, Fungus that causes Athlete's Foot, Turmeric (a spice), Olive oil, Canola oil, Uranium glass, Some postage stamps, Highlighter pens, Honey, Ketchup, Cotton balls, HVAC repairs, Pipe cleaners (chenille craft sticks), Tonic Water, Glowing Vitamins, Chlorophyll, , Tooth Whiteners, Body fluids like semen, Germs, Antifreeze, Laundry Detergent and Other Cleaners, Banana Spots, Certain plastics, White Paper, Scorpions, Bank notes, Anemones, Golf balls, Dogs and Cats urines etc.

Strictly speaking, a black light is a kind of UV light. ... Black lights emit ultraviolet radiation (UV light). UV is radiation with a wavelength just shorter than that of violet light, which is the shortest wavelength of light in the visible part of the electromagnetic spectrum.

Black light is called “black” because ultraviolet light is invisible to the human eye. If a black light only emitted ultraviolet light, it would be invisible. Most black lights appear blue or violet because they emit short wavelength visible light (blue to violet)

When UV light bounces off objects that contain special substances called phosphors, interesting things happen. Phosphors are substances that emit visible light in response to radiation. ... For example, your teeth and fingernails contain phosphors, which explains why they glow under a black light. 

Although the low-power UV-A emitted by black lights is not a hazard to skin or eyes and can be viewed without protection, powerful ultraviolet sources present dangers and require personal protective equipment such as goggles and gloves. 

As a precautionary measure, please  1. Do not directly the UV light into eyes;  2. Keep away from your children.

Try SensoLum products completely risk free for 30 days. If for whatever reason you decide you aren’t satisfied, contact our helpful customer support within 30 days of receiving your order and we’ll refund you!

Due to high demand in the recent period and slow delivery carriers, please allow 7 to 14 days (usually 9) for the delivery, some countries may take a bit longer depending on their postal service. You can also choose fast or VIP delivery in the checkout page.

For any question, we are just an email away.