What is the reason why galvanized wire hangers are black?

Our newly purchased galvanized silk hangers have been used for some time and found that the color of the galvanized clothes hangers has become dull and even dark. What are the causes of the discoloration of the galvanized clothes hangers and what are the hazards to our bodies?

The zinc surface of galvanized clothes hangers is often found to be blackened on the surface of the iron wire. This is caused by the chemical stability of the zinc. During the galvanizing process, zinc reacts with the oxygen in the air to form a new chemical. Material, which is relatively stable and black. There are also other factors, such as moist air, impurities in the manufacturing process, hand sweat and its lubricant, which will cause the galvanized surface to become dark. Does not harm the human body or clothing