Science, Tech, Math › Science Answers to Common Questions About Making Slime Topics include ingredients plus coloring and storing slime Share Flipboard Email Print Dorling Kindersley / Getty Images Science Chemistry Activities for Kids Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists 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 January 13, 2019 Here are answers to common questions about making slime, concerning slime ingredients, coloring slime, and storing slime: Making Translucent or Opaque Slime Basically, your slime will be about as transparent as the glue you use to make it. If you use white school glue, then your slime will be opaque. If you use translucent clear or blue glue gel (or another see-through color), then your slime will be translucent. Mixing Slime Solutions in Advance You can prepare the borax and glue solutions days or weeks before actually making the slime. How to Color Slime If your glue is tinted, then your slime will be colored. You can mix food coloring in with either slime-making solution. You can also add glitter or other decorations. Slime's Shelf Life Slime doesn't go bad, but you might want to toss it if it develops mold or dries out. Refrigerated slime, kept in a sealable plastic bag, should last for a couple of weeks, though even unrefrigerated bags have lasted much longer.