What should you do with the borax you have leftover from making slime? Use it to make crystals! Find out how on Gross Science. National Corporate funding for NOVA is provided by Carlisle Companies.

1. Place 1 tablespoon of water in a small plastic cup. Add ¼ teaspoon of borax. Mix until as much borax dissolves as possible. This is your borax solution. If you would like your slime to be a certain ...