Acid Copper Brightener For base layer of Button, Zipper, Buckle bright and shining, best choicce for ... layer for hardware 510Acid Copper Brightener for base Layer of Button, Zipper, Buckle (rack plating)Purpose and Feature:1. ... applied in rack plating, as the based layer for button, zipper, buckle, get a shining and bright layer ... 510 Acid Copper Brightener For base layer of Button, Zipper, Buckle