... 10638.4, patent of invention 01105380.1 etc, via of testing report from National product quality & control bureau: NPQC No.3 ... . 200150013, as well as via of testing report from the National environment inspection bureau: SH(YWJ)No ... , 18 k gold, and imitated gold), it not only for rapid plating, but for groove plating, hanging plating, or roll plating ...