Playing with Oobleck is one of the boys favorite messy play activities.
If you are unfamiliar with Oobleck its is a mix of cornstarch and water that has properties of both a solid and a liquid. You can read more about oobleck here.
I mixed 2 cups cornstarch, 1 1/2 cups water and food coloring.
We played with some plastic dinosaurs and the oobleck on trays.
Its fun to play with when you pick it up and squeeze it it feels solid put it will drip and pour.
Scooping it with spoons.
The boys asked for water to wash the dinosaurs. I brought out some warm soapy water.
I will say this is a pretty messy activity and the boys hands were slightly stained blue when we were finished but it washed off in the bath. Even though they made a mess they were engaged and playing with it for close to an hour.