Twenty or thirty years ago, cosmetics that deliberately added toxic ingredients such as heavy metals led to serious excessive heavy metals did exist. Now with the strengthening of national supervision on cosmetics, such problems have rarely happened. Nowadays, the practice of using silverware and water to detect whether cosmetics contain heavy metals is circulating on the Internet. It is said that cosmetics can be applied to the back of the hand and rubbed repeatedly with silverware. If the skin turns black, it means it contains heavy metals. Another way is to pour cosmetics into clear water. If it sinks, it means it contains heavy metals.
This detection method is unscientific. Maybe some simple chemical reactions can be preliminarily judged, but if the content of heavy metals in cosmetics is small, the measured results will be inaccurate, and it is even more impossible to determine whether the content of heavy metals exceeds the standard. Science has brought us advanced products, and our consumers should keep up with the pace of science and technology, and understand cosmetics with scientific methods and attitudes. At present, there are related instruments for the detection of cosmetics, and the detection results are very detailed and accurate, but the detection cost is relatively expensive.