1/2 cup cornstarch
2 cups water
Over medium heat mix cornstarch and water until it becomes smooth and thick (almost like Vaseline). Separate into containers, add food coloring, and mix.
I used up&up baby food containers. I used to save the Gerber containers, but they don't seal well enough to hold liquid or seal air tight for storing something like paint.
We have also painted with corn syrup, or sweetened condensed milk (colored with food coloring) The corn syrup is mostly clear, and the condensed milk has a iridescent sort of look.
|Green sweetened condensed milk & pink (cornstarch) finger paint|