After hanging tin, the copper chafing dish is not poisonous.

Copper chafing dish must be "tin-hung" because copper is a "heavy metal", and heavy metal ions will solidify protein, which is toxic. No matter whether it is a brass chafing dish or a copper chafing dish, it must be hung with tin and hung to the top.

Specific benefits of hanging tin:

Copper chafing pots are prone to produce patina after being placed in a humid environment for a period of time. This substance has certain toxicity. Eating such copper tableware will lead to nausea, vomiting and other symptoms, and even serious shock. Tin plating can prevent copper pots from producing patina, and tin-plated copper pots are not easy to produce metallic taste when cooking chafing pots.

Copper pots are very easy to react with oxygen and produce patina harmful to human body. However, at present, the copper pots used in hot pot restaurants to make copper hot pot are all tinned, which can effectively prevent the copper pots from producing substances harmful to human health, and can also make the cooked hot pot have no metallic taste.

Copper utensils are prone to produce patina, and the parts contacting with food must be tinned. Tinning and its alloy are a kind of coating with good weldability and certain corrosion resistance.