This was a fun little activity! And you can make it with the supplies you have leftover from THIS activity plus a little cornstarch!
Here's what you need:
school glue (clear or not)
craft sticks for stirring
food coloring (optional)
1) Dissolve 1/2tsp of borax into 2 tbl of warm water in the first plastic cup. Stir until dissolved. Add food coloring if you would like.
2) Put 1 tbl of glue into a second plastic cup. Add to that 1/2 tsp of the borax solution and 1 tbl of cornstarch. Let it sit without stirring for 10-15 seconds.
3) Stir with the craft stick until you can't any more. At that point take the impossibly sticky glop and begin to form it into a ball between your hands. Eventually the stickiness will subside and you will have a bouncy ball!