Bob the Bouncing Blob
You don’t have to name your blob Bob. It might be more of a Bill, or a Babette.
WHAT YOU NEED: paper towels, 2 small plastic cups, measuring spoons, white craft glue, Epsom salt, warm water, plastic spoon, Ziploc bag
WHAT TO DO:
- Cover your work surface with two layers of paper towels.
- Put 1 tablespoon of glue into one cup.
- Put 1/2 teaspoon of Epsom salt and 1/2 teaspoon of water in the other cup and dissolve that solution. It’s okay if all the Epsom salt didn’t dissolve.
- Pour the solution into the cup of glue. Stir.
- Do you notice a change in the solution? Grab the glob you’ve made and pile it on your paper towel-covered work surface.
- Fold the towels over the glob and gently press the extra water out of it. Now discard the paper towels.
- Store your blob in a resealable plastic Ziploc bag. (Never pour a polymer concoction down the drain. If you need to discard it, put it in the trash).
WHAT HAPPENS: You’ve made a blob that you can bend, twist, squeeze, smoosh, roll, and bounce.
WHY IT WORKS: Glue remains a compound while making things stick together because it contains polyvinyl alcohol. That acts as a binder, keeping the glue semi-liquid and less likely to dry out. This makes glue perfect for making a polymer. The glue cross-links with the dissolved Epsom salt to create strong, flexible chains of molecules – which are a characteristic of polymers. Roll them into a ball and they bounce!