Why are some filters copper colored but not made of copper?

     Why do some filters screen have copper color but not copper material? Today Warner Small series for you to explain the reason: the filter screen surface is copper color is the iron filter screen, the iron material itself is the composition of low carbon steel 235, the surface after galvanized is generally white, however, this copper color is generally used less, so customers still think it is made of copper. After the explanation of our technical personnel, the customers suddenly realize that this kind of product is also called color plating in the industry, this is a new technology of galvanizing. Generally speaking, we say the galvanizing products are mainly white. We only use this technology when we have special needs, so it makes many customers misled by the color of the surface, so sometimes we can also take a magnet to test, if the magnet can suction filter proof that this process, I believe that everyone through reading should understand.