Have you dried this air drying clay before?

There are many types of colorful clay these days. Some need baking and some don't. They are light and never get on your hands. Before these new and handy products, I used this old type clay many times. It dirties your hands but it's extremely wonderful to make something and color by your own hands. Ta-da! I made this myself and use it at home! I have known it as Air Dry Clay or Self-Hardening Play Dough. How do you call it?