Purple sand thermos cup can make tea, which has the effect of health care and conditioning. But the inferior purple sand cup is added with chemicals. If drunk for a long time, harmful substances will dissolve in water, which may affect people's health. So how to identify the true and false purple sand thermos cup?

1, meet. Because it is clay and not glazed, the surface of the new purple sand cup can't be bright, but rough. In order to sell well, fake pottery pots are generally waxed and polished.

2. Try boiling water. Pour the freshly boiled water into the cup and pour it along the pot. Cover the cup, and you will see that the water is slowly sucked up instead of flowing down. Wet the lid slowly, and then suck it dry slowly. This is a sign that the purple sand cup has two holes and good air permeability.

3. Leave the brewed tea in the teacup. A good purple sand thermos will not turn sour for two or three days, but a poor one will not.

The introduction on how to identify the true and false purple sand thermos cup is here.