科学研究表明,在潮湿的环境中,茶水会迅速氧化出褐色茶锈,其中含有镉、铅、汞、砷等多种有害物质。而没有喝完或存放较长时间的茶水,暴露在空气中,茶叶中的茶多酚与茶锈中的某些物质在空气中发生氧化作用,便会生成茶垢,并附在茶具内壁,而且越积越厚。有人曾对茶垢进行了抽样化验,发现茶垢中还含有某些致癌物,如亚硝酸盐等,它们对人体健康非常有害。 Scientific research shows that in humid environments, tea will quickly oxidize brown tea rust, which contains cadmium, lead, mercury, arsenic and other harmful substances. Without drinking or storing a long time of tea, exposed to the air, the tea polyphenols and tea rust in some substances in the air oxidation occurs, it will generate tea scale, and attached to the tea wall, And thicker and thicker. Some people have carried out a sample of tea scale tests found that tea scale also contains some carcinogens, such as nitrite, they are very harmful to human health.