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Hard copper plating that can be etched best

I want to do chemical etching on hard copper of hardness 190-210. My problem at the moment is getting stains on roller while etching with ferric chloride [on eBay or Amazon]. What parameters should I change in hard copper plating? Currently using 28 degree C as plating temperature and current density of 20 amp/sq dm. Any suggestion on pre treatment or post treatment is welcomed.

Kaushik Magiawala
Plating shop employee - Ahmedabad, Gujarat, India
April 8, 2009

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