(1) Do not put too much desiccant to avoid staining the bottom of the crucible.

(2) When moving the dryer, hold it with both hands and press the lid tightly with your thumb.

(3) When opening the dryer, do not lift the lid up. Hold the dryer with your left hand, and carefully push the lid with your right hand. After the cold air enters slowly, you can push it completely. The lid must be placed on the table.

(4) Do not put too hot objects in the desiccator.

(5) Sometimes when a hot object is put into the dryer, the air will heat up and expand the lid. In order to prevent the lid from being knocked over, you should hold it down by hand and push the lid slightly away from time to time.

(6) The crucible and sediment after burning or drying should not be placed in the desiccator for too long, otherwise the quality will increase slightly due to the absorption of some moisture.

(7) The color-changing silica gel turns blue when dry, and turns pink when wet. The damp silica gel can be dried at 120°C and used repeatedly after it turns blue until it breaks and cannot be used.