There are two types of brass. Ordinary brass contains 62% or 68% copper and zinc; special brass contains aluminum, nickel, manganese, tin, lead, and iron in addition to copper and zinc. , silicon, etc. Generally, concentrated ferric chloride solution can be used for copper etching. The reaction formula is as follows: Cu+2FeCl3==CuCl2+2FeCl2

Zn+2FeCl3==ZnCl2+2FeCl2

The method is Take a copper plate and wash it, seal the surface with liquid paraffin. After engraving the trademark on the wax surface, brush it clean with a brush. Apply a concentrated solution of ferric chloride to the carved gap. After a certain period of time, remove the wax layer and wash it with clean water. Wash and serve. I don’t know if that’s true, but it seems to be in line with your factory’s operating techniques. I’m sorry!