You have to add one whole box of cornstarch (16 oz) A cup in a half of water Then mix with hands Keep adding 1/2 cup of water every time it gets hard You need to add 1 whole cup of water during the whole experiment Then when it is done and your out of cornstarch and water you need to mix and then put in cake pan When you are done it will be able to go back how it was at the beginning.