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