Many people like to use stainless steel cups to make tea, but this is actually the wrong way to do it. Stainless steel cups contain chromium, a heavy metal that can corrode the protective layer of stainless steel cups when brewed with tea. The corroded stainless steel water cup will be released because the protective film is destroyed, and if it is used continuously, it will cause harm to the human body. Chromium is a blue-white multivalent metallic element, commonly known as bivalent chromium, trivalent chromium and hexavalent chromium. It is hard and brittle, and corrosion-resistant, so it is mostly used in stainless steel and other products.
Clinically, the harm of hexavalent chromium and its compounds to the human body is usually manifested in three aspects. One is to damage the skin, leading to dermatitis, pharyngitis, etc. Second, it damages the respiratory system and causes diseases such as pneumonia and tracheitis. Third, it damages the digestive system, accidental ingestion or even long-term exposure to chromate, which can easily cause gastritis, gastric ulcers and intestinal ulcers. Excessive intake of hexavalent chromium can also lead to kidney failure and even cancer.
