This is the funnest, messiest, yet most entertaining sensory material EVER!! To make oobleck- all you need is cornstarch and water! We do two cups corn starch, one cup water to create the perfect wet, yet dry, slimy goop that we just love to play with! This is the perfect outdoor summer sensory activity to set up next to the baby pools! We get ourdinos (click the link to buy from amazon- we play with this set ALOT!) all messy and then gave them + ourselves a rinse in the baby pool! We added brown food coloring to ours to make it look like mud. We do this a lot with blue food dye and add ocean creatures! Happy Ooblecking!!