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ru0629

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The problem may come from brass substrate .Brass is difficult to plate material  unless you use copper cyanide strike or cyanide predip .Even nickel strike will bring some uneven color .you can try nitric contain etching solution to delete unalloyed zinc .
11Â¥2008-06-12 21:18:47
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fzhang239

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12Â¥2008-06-14 13:57:53
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