The influences of carious oxidizing agents, existing as impurities in nickel plating baths, were investigated and their maximum limits of allowance were determined. Baths of bright nickel plating and of ordinary dull nickel plating were both employed. As oxidizing agents, nitrate, hydrogen peroxide, chromic acid and chlorine were used here. Among these, chromic acid caused the most injurious effect and chlorine had no marked effect. Removal of these oxidizing agents were attempted by various methods, among which an electrolytic method was found most satisfactory.
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