By etching resisting selecting then apply corrosion agent called etching solution that non-protected copper will be moved away by chemical reaction.
Those protected area will leave there.蝕刻：曝光完成的材料基板經過蝕刻藥水沖洗，會將沒有乾膜保護的部分銅層蝕刻去除，而留下有硬化乾膜保護的線路。
[commericial adverrtising]
- Item:: Reel to Reel Vertical Clamping PTH
