To make the putty you just need 3 ingredients...white school glue, food coloring, and liquid starch. (Thanks, EB, for buying the ingredients for us!!!)
1st we mixed a 1/2 cup of white glue with a 1/2 cup of liquid starch. (We originally mixed in just 1/4 cup of starch, but added more later to make it more firm and less gooey.)
Then O added in green food coloring and stirred it with a spoon. We let it sit out to dry for several hours.
Then it was time to play! This putty is MUCH more slimy and messy than the therapy putty that O typically plays with. I'm keeping it on the kitchen counter, so that she only has it when she is closely supervised. I spread out a washed, unfolded cereal bag for a play surface so the putty would not stick to the grout and tiles on our kitchen countertops.
O LOVES this putty, and even though it is potentially very messy, I'm sure we'll be making more soon!