Unlike the sawdust dough, the sand dough, and even the oil dough, the cornstarch dough uses no flour, but instead calls for cornstarch and salt. This makes a good play dough for someone who might be sensitive to most flours, or perhaps to use up some more of that cornstarch that I keep making you buy for other art supply recipes.
Unlike the other dough recipes that I’ve shared, as well, this dough does require cooking over low heat, which actually most play dough recipes do require. It’s just something to be aware of when you have little helpers on hand.
Mix all the ingredients except for the food coloring in a saucepan, and then begin to heat it slowly over low heat, stirring it pretty much constantly—this will take a while.
You’ll know that the dough has cooked long enough when it loses its paste-like consistency and wants to ball up on your spoon. It should start to look like play dough, you know?
When that happens, remove the dough from the heat (you can scorch this stuff, but man, you do not want to), let it cool down (this will also take a while), and then knead it by hand until it looks just perfect.
You can separate this dough into small batches and dye it with either liquid or gel food coloring—knead it in by hand, being careful not to get the coloring all over you.