Science, Tech, Math › Science How to Make Glowing Water Share Flipboard Email Print Create Glowing Water With This Simple Experiment. Charles O'Rear/ Corbis Documentary / Getty Images Science Chemistry Projects & Experiments Basics Chemical Laws Molecules Periodic Table Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated October 01, 2018 It's easy to make glowing water to use for fountains or as the basis for other projects. Basically, all you need is water and a chemical to make it glow. Here's what you need to do. Chemicals That Make Water Glow in the Dark There are a couple of ways you get science projects to glow in the dark. You can use glow-in-the-dark paint, which is phosphorescent and glows anywhere from a few minutes to a few hours. Glowing paint or powder tends not to be very soluble, so it is good for some projects and not others. Tonic water glows very brightly when exposed to black light and is great for edible projects. The fluorescent dye is another option for a bright effect under a black light. You can extract non-toxic fluorescent dye from a highlighter pen to make glowing water: Use a knife to (carefully) cut a highlighter pen in half. It's a pretty simple steak knife and cutting board procedure.Pull out the ink-soaked felt that is inside the pen.Soak the felt in a small quantity of water. Once you have the dye you can add it to more water to make glowing fountains, grow certain types of glowing crystals, make glowing bubbles, and use it for many other water-based projects.