Nickel, Bath

A bath for the electro-deposition of nickel. A great many formulae have been given. Metallic nickel is di olved in 1 vol. sulphuric acid mixed with 2 vols. water. Neutralize with ammonia, and add of ammonium sulphate one-half the weight of metallic nickel originally used; 135 parts of nickel will be enough for a bath of 10,000 parts. 392   STANDARD ELECTRICAL DICTIONARY. Other formulae are as follows:   Double nickel-ammonium sulphate,        4   parts.   Ammonium carbonate, 3   " Water 100   "   Nickel sulphate, nitrate or chloride,   1   "   Sodium bisulphate, 1   " Water, 20   " Nickel anodes are used in the bath to maintain the strength. Too much care cannot be exercised in the absolute cleanline of the articles to be plated. A too alkaline bath gives a disagreeable yellow color to the deposit; too acid a bath gives badly adhering deposits.