http://www.colorthenet.com/2010/07/18/washable-paint/

How to make washable paint?
I want to have a “paint war” at my birthday party, but its expensive to buy enough washable paint so I need a recipe to make washable paint that won’t stain skin or clothes and is also safe for the environment since we’ll be outside. also that u can make in large quantities and for cheap
ty
I heard of using chalk somehow?… lol
You can use a paint called “tempera” paint. You can find it in any hobby store or most arts and crafts sections in stores. Many people use it for face paints. It washes off very easily. It does not stain clothes. You can even add a little bit of dish washing liquid to it before you use it to make it even easier to wash off. I hope this helps. Chris
Art time! Washable Paint
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