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To Tin by the Moist Way

Make a solution of 1 part protochloride of tin in 10 parts water, to which add a solution The tin solution is prepared with 1 part crystallized chloride of tin, 2 parts water, and 2 parts hydrochloric acid. The copper solution, with 1 part sulphate of copper, 16 parts of 2 parts of caustic soda in 20 parts water; water, adding ammonia sufficient to redissolve the precipitate first thrown down by it. Zinc and galvanized iron can be treated, according to Boettger, directly by the copper solution, without using the tin salt. The above process may be found useful by gilders, tin plate, and to stir up the fluid during the and for various ornamental purposes. the mixture becomes turbid, but this does not affect the tinning operation, which is effected by heating the objects to be tinned in this fluid, care being taken, at the same time, to place in the liquid a piece of perforated block tinning with a rod of zinc. 3637. Weil's Process for Coating 3640. To Tin Iron Without the Aid Iron with Copper. This process yields a of Heat. To 105 quarts water are added 6½ coating of copper of great brightness and pounds rye meal; this mixture is boiled for strong cohesion. The object, whether of 30 minutes, and next filtered through cloth; cast or wrought iron, is freed from rust by to the clear but thickish liquid are added 233 immersion for from 5 to 10 minutes in water pounds pyrophosphate of soda, 374 pounds protochloride of tin in crystals (so-called tin 3646. To Tin a Worn Copper Kettle. salt), 1474 pounds neutral protochloride of A thick coating may be obtained by preparing tin, 3 to 4 ounces sulphuric acid; this liquid a tinning solution of zinc dissolved in muriis placed in well made wooden troughs, and atic acid, making the solution as thick or serves more specially for the tinning of iron heavily charged with zinc as possible, adding and steel wire (previously polished) for the a little sal-ammoniac. Clean the inside of use of carding machines. When, instead of the kettle, place it in a charcoal fire until a the two salts of tin just named, cyanide of piece of block tin placed inside melts, then silver and cyanide of potassium are taken, the rub the melted tin with some of the tinning iron is perfectly silvered. solution, quickly on the copper surface, by