How to use thermal insulation stone in famine

The use method of thermal insulation stone in game famine is: put it by the fire, and the stone will heat itself. When the stone gets hot, just pick it up and put it in the shortcut bar.

In fact, thermal energy stone, built in the second technological survival column, needs stone pick * 1, flint *3, rock * 10. Thermal energy stone has five states.

1, white frosting state: 0℃, blue state: 0℃-25℃.

2. Initial grayish white state: 25℃-40℃

3. Yellow twilight state: 40℃-50℃.

4. Orange luminous state: above 50℃.