Borax (available in the laundry detergent aisle)
Non-toxic white school glue
Food coloring (optional)
Small container with lid
Safety note: Borax is an irritant and should be kept out reach of children and pets. While safe in diluted solutions, borax can be harmful if ingested.
Measure 1 teaspoon of borax and pour it into the small container. Measure 2 tablespoons of water and add to the small container. Close the lid on the small container tightly and shake vigorously for 15 seconds. Set aside when done.
Pour 3 tablespoons of water and 3 tablespoons of glue into the plastic cup. Stir.
If you would like colored slime, add a few drops of food coloring to the glue and water mixture and stir.
While stirring, slowly pour the borax solution into the glue solution. Try to pour the borax solution all around the plastic cup, and leave any undissolved particles of borax in the small container. You may need to squeeze the slime with your hands to make sure it’s well mixed. You may want to scoop the slime onto a plate so it’s easier to knead. Remember to keep your slime away from the carpet and furniture! Storing it in a sealed plastic bag will prolong its use.
White glue is loaded with long chain molecules that are called polymers. Borax links those polymers together into a big network; this is called cross-linking. The result is even larger polymers that create a thickened slime. The primary polymer in white school glue is called polyvinyl acetate.
How does the texture of the slime change when you add less borax? More borax? Less glue? More water?
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