Nowadays, the paper cups have become more and more popular because of their convenience. However, few people know that it is necessary for people to grasp some skills so as to choose high-quality products and maintain the physical health of the human body. The cups with poor quality can seriously affect the human health. In order to help people choose good products and prevent possible danger, several skills will be introduced as follows. 

First, people should observe the colors of these cups under the light. Some people think that the paper cups should be white so as to maintain the cleanness. In fact, some manufacturers add optical bleaching agent into the products to make the colors white. Then, these toxic substances can enter the human body to cause cancer. When people are choosing paper cups, they should observe the colors of these cups under the light. People should not buy the products, if the cups are shown to be blue, which means that the addition of optical bleaching agent is excessive.

Second, people should pinch the cups with their fingers to check the thickness of the material. The poor-quality cups will become distorted when people fill water or beverage in them, which will seriously affect the normal use. According to the experts, the high-quality paper cups can bear the water without leakage for nearly 72 hours.

Third, people should not use the damped cups. Generally speaking, people usually stack up the cups. However, the mycete can be easily caused when the cups are polluted or damped. At the same time, when the cups are stacked up, the printing ink of pictures and written characters on the external surface of one cup will affect the internal surface of the other one. The printing ink always contains benzene and formaldehyde to affect the human health. Therefore, it is beneficial for people choose the products with few pictures.

Fourth, people should different kinds of paper cups for cold beverage and hot beverage. The paper cups can be divided into two kinds, namely, one for cold water and the other for hot water. When people fill hot water in the former one, the slab wax contained in the inner surface of the cups will be dissolved into the water to threaten the human health. Therefore, people should strictly grasp the correct use so as to prevent possible diseases and keep healthy to the full extent.