For silvering copper, covering the worn parts of plated goods, etc.
1. Nitrate of silver, common salt, each 30 grs.; cream of tartar, 3 1/2 drs. Mix. Moisten with cold water and rub on the article to be silvered.
2. Pure silver (precipitated from the nitrate by copper), 20 grs.; alum 30 grs.; cream of tartar, 2 drs.; salt, 2 drs.
3. Precipitated silver, 1/2 oz.; common salt, sal ammoniac, each 2 oz.; corrosive sublimate, 1 dr. Make into a paste with water. Copper utensils are previously boiled with cream of tartar and alum, rubbed with this paste made red hot and afterwards polished.
4. Nitrate of silver, 1 part; cyanide of potassium, 3 parts; water enough to make a paste.
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