I cannot remember where I found this fun activity (sorry whoever you are!!)
This is is perfect for kids to be artistic & creative (and clean) in the tub! It's made of soap!
1/4 c. baby wash (it calls for liquid dish soap, but I think that is too harsh)
2 Tbsp. cornstarch
Several drops food coloring
A smidge of water, just enough to make good paint consistency.
This makes bathtime so fun, and it's clean! I keep mine stored in a Tupperware that has 'dividers' for each color (and a lid). And they last as long as you need them!