The raw materials are dissolved in the mold at high temperature, pressed with mud embryo, and cleaned after the mold is connected and welded.

The raw material of black gold necklace is mainly precious metal rhodium. Put the raw materials into the mold, dissolve them in gold water at high temperature (add boron powder), press them into the grinding tool with mud embryo, and take them out after cooling. Then connect the model and weld it, and finally clean the black gold necklace.

Black gold, namely rhodium gold, is a very precious rare metal, mainly distributed in South Africa. Globally, only about 25 tons of black gold are mined every year. Many luxury goods usually contain black gold.