There are also some interesting methods of applying a thin coat of silver to copper articles, and while this method is not recommended for very extensive use, still some very good effects can be produced by applying the silvering solution to the copper where a design has been etched or chased and then rubbing with an old smooth piece of emery cloth, allowing the silver to remain in the background. The copper must, of course, be perfectly clean.
No. 1. With a little water make a paste of nitrate of silver 80 grains, common salt 40 grains, cream of tartar 7 drachms, and rub on to the copper.
No. 2. Another silvering paste is made of chloride of silver, 4 ounces; cream of tartar, 75 ounces; common salt, 10 ounces, and water sufficient to form a paste. Keep this paste away from the light, and apply by rubbing on the copper with a piece of cloth.
No. 3. A good silvering fluid is composed of distilled water, 5 ounces; chloride of silver, 7 ounces; potassic oxalate, 10 ounces; common salt, 30 ounces; chloride of ammonia, 4 ounces. Mix together and apply by rubbing on the metal with a piece of soft cloth.
No. 4. Another simple method of silvering copper and brass is to put one ounce of aquafortis and one ounce of silver scraps in a crockery dish and set it in a warm place until the silver is entirely dissolved. Then mix with it enough cream of tartar to make a thin paste. This paste will silver copper or brass when rubbed on with a soft cloth.