How to make clay hard (air-dry, so that it will not deform when pinched)

1. First, make a shape with soft clay.

2. Then prepare a container.

3. Pour a proper amount of baking soda into the container.

4. Then pour a proper amount of water into the container and let the baking soda be fully diluted and dissolved.

5. Next, soak the clay model in baking soda water for half an hour. Baking soda can quickly harden and set clay.

6. Finally, just take out the clay shape. At this time, it has been hardened and shaped, as shown in the figure.