1. When placed in a sealed space, MINE will begin to absorb moisture. 2. Once it has absorbed enough moisture, the color indicator will turn blue. (It typically lasts for 30 days with normal use.) When it turns blue, remove the frame and put it in a microwave on defrost mode (200W-300W) for 11 minutes, or in an oven (150°C-300°C) for 90 minutes. 3. The indicator displays two colors: white (dry) / blue (wet). 4. After setting the frame with the stone, the indicator will slowly change from blue to white within 4 hours. 5. Once it turns white, it can be dehumidified again. Please use it by placing it in a sealed space. ★ During drying in the microwave, the dehumidifying stone becomes very hot, and the water inside the stone evaporates. Please wait for the dehumidifying stone to cool down before handling it.