This section is from the "Encyclopedia Of Practical Receipts And Processes" book, by William B. Dick. Also available from Amazon: Dick's encyclopedia of practical receipts and processes.
3303. To Case-Harden Small Articles of Iron. Fuse together, in an iron vessel or crucible, 1 part prussiate of potash and 10 parts common salt, and allow the article to remain in the liquid 30 minutes, then put them in cold water and they will be case-hardened.
3304. To Clean a Shot Gun. Wrap clean tow around the cleaning rod; then take a bucket of tepid water - soap-suds if procurable - and run the rod up and down the barrel briskly until the water is quite black. Change the water until it runs quite clear through the. nipple; pour clean tepid water down the barrel, and rub dry with fresh clean tow; run a little sweet oil on tow down the barrel for use. To clean the stock, rub it with linseed oil. If boiling hot water is used the barrel will dry sooner, and no fear need be apprehended of its injuring the temper of a fine gun. Some sportsmen use boiling vinegar, but we cannot recommend this method. The reason hot water does not injure the gun, is that boiling water is only 212° Fahr., and the gun was heated to 450° to give it its proper temper.
3305. Grease for Anointing Gun-Barrels on the Sea-Shore. It is said that an ointment made of corrosive sublimate and lard will prove an effectual protection against the rusting of gun-barrels on the sea-shore.
3306. To Protect Polished Steel from Rust. Nothing is equal to pure paraffine for preserving the polished surface of iron and steel from oxidation. The paraffine should he warmed, rubhed on, and then wiped off with a woolen rag. It will not change the color, whether bright or blue, and will protect the surface better than any varnish.
3307. To Protect Polished Metal from Rust. Take 10 pounds gutta-percha, 20 pounds mutton suet, 30 pounds beef suet, 2 gallons neats' foot oil, and 1 gallon rape oil. Melt together until thoroughly dissolved and mixed, and color with a small portion of rose pink; oil of thyme or other perfuming matter may be added. "When cold the composition is to be rubbed on the surface of bright steel, iron, brass, or other metal, requiring protection from rust.
3308. To Remove Rust from Steel. Rust may be removed from steel by immersing the article in kerosene oil for a few days. The rust will become so much loosened that it may easily be rubbed off. By this simple method badly rusted knives and forks may be made to present a tolerable appearance, but for new goods there is no way to remove rust from metal but by getting below it, or renewing the surface. Where it is not deep-seated, emery paper will do, but if long standing the goods must be refinished.