Process flowCopper piece→degrease→water rinse→nitric acid dip→water rinse→130B、C、D blackening→water rinse→drip dry or air dry→patina agent spray or dip→drip dry→baking→sealing→lacquer→bakingC. Attentions1. Be sure that the oxide blackening is uniform, film is tight, without peel-off.2. After blackening and water rinse, drip dry or air dry it.
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