Softest Play Dough Recipe. Review-this stuff is AWESOME. 2 parts cornstarch 1 part conditioner. It is soooo soft. Maybe a bit too soft to really shape anything, but it holds an imprint great. It does crumble a bit, so a play mat or outside or kitchen play for easy clean up. Didn't add food coloring. Definitely better for the toddler age. Kiddo loooved it. Not sure about the shelf life. Made my hands amazingly soft, too!