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What is a good pickle to remove nickel oxide which can cause 18k white casting to be gray?

April 26, 2017casting cause good Gray nickel oxide pickle remove white

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What is a good pickle to remove nickel oxide which can cause 18k white casting to be gray?

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• Oxides that are harder to remove, such as those generated with nickel white gold alloys, can be removed by using 5% nitric acid. Fire scale is best removed form silver alloys by using a 10% sulfuric acid. You must add the 90% water into the acid – not vice versa.