Start with about 30 mL (2 tablespoons) of Elmer's glue in a beaker. If "pretty" putty is desired add a few drops of food coloring at this time. Add Sta-Flo liquid starch a few drops at a time with constant stirring. Continue adding the starch until putty no longer sticks to the sides of the beaker. Now, before touching the putty, coat your hands with some liquid Sta-FloTM starch because the putty is very sticky. Add little bits of starch to the putty while working it with you hands. Continue until the putty is no longer sticky. When finished, place in a sealed container so that the putty does not dry out.
Variation I (contributed by Ed M. Brogie): Mix one film canister of glue( add food color if desired) to one film canister of water, mix in a zip lock bag. Then add one film canister of sta flo starch or one film canister of saturated solution of twenty mule team borax, they both have the same crosslinker. You can pre-mix the glue to fifty fifty with water and then add two canisters of the diluted and colored glue before adding the crosslinker.
Variation II (contributed by Brad O'Neil): The same can be done using borax solution, as the crosslinking substance for the polymer. The result is a bouncing rubber ball. Try it, the students love it!
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