Koolaid is a flavored drink mix and when you add it to the playdough it adds a scent and a color to the playdough. You can get cherry flavored which will turn it pink or grape flavored which is of course purple in color and grape scented. There is strawberry and lemon lime which is a pretty green color. There is a blue one I can't remember the flavor name. Mixed berry I think maybe. It is fun to make more than one color.