This kind of acid is usually hydrofluoric acid, which is used in many factories because of its relatively low cost and fast operation speed, but it is very harmful to the environment, because the cup after pickling has to be washed with water and dried before packaging. This waste water is polluted water.

Generally speaking, frosting is not allowed for exported cups and wine bottles, but I don't know how it is stipulated in China.

As for whether it hurts me, I can't think about it, but it will definitely not be good for my health.