There are a lot of interesting science projects you can try in which you make things glow in the dark using a black light or ultraviolet lamp. Here are some fun glowing projects to try. Most of these projects glow due to fluorescence, though some projects involve phosphorescent materials that glow on their own, but much more brightly when exposed to a black light.
This is a lot like the Mentos and diet soda fountain except you replace the diet soda with a common drink that glows when exposed to black light.
Form your name or any word you like with plastic tubing filled with a glowing chemical you prepare yourself. This is a safe and economical alternative to a neon sign.
There are a couple of different ways you can make water glow under a black light. Give it a try and then use the glowing water in a fountain or to use in other black light projects.
Some foods glow in the dark. Regular gelatin will not glow when exposed to a black light, but you can substitute another liquid for the water to make a treat that glows while you eat it.
This crystal geode that you make from common household materials will glow as soon as you turn off the lights. If you add a black light then the glow will be much more intense.
Glowing slime is non-toxic and easy to make. The glowing slime is phosphorescent, meaning it will glow for several minutes to several hours after you turn out the lights. However, it will glow very brightly when exposed to ultraviolet light, such as from a black light.
Alum crystals grow quickly and easily. While some crystals can't be made to glow, these will pick up a luminescent chemical so that they will respond to a black light.
There are several ways to make ice that will glow when illuminated by a black light. If you freeze the ice into a sphere, you'll get a sort of glowing crystal ball.
If you can blow bubbles, then you can blow bubbles that glow under a black light. Normal bubble solution will not glow, but that is easy to fix!
What's creepier than a flickering jack-o-lantern? How about one that emits a ghoulish glow without the fire? Make a pumpkin glow; recharge or brighten the glow with a black light.