This stuff is great for so many reasons. Water and cornstarch. That's it. Slowly add the water, and stir. Don't over pour. This stuff is so cool. It's wet, but it's dry, it's hard, but it's soft. It's liquid, but it's solid. It looks like a terrible mess, but it's not. If your kids drip it through the house, just let it dry, and vacuum, or sweep. It's like dust. If the kids stood away and let their hands dry, it would turn into chalk. Most importantly, the kids LOVE it!!!! Even the big kids! It's hard to explain, you just have to try it!