Red brass is composed of:
17 parts Tin, 81 parts Copper,
2 parts Cupro-roanganese, or from 14 parts Tin, 85 parts Copper,
1 part Cupro-manganese.
To discover the presence of lead in brass add a few drops of sulphuric acid to a solution of the brass in nitric acid. The volume of the resultant precipitation will determine the quantity of lead. If there is a large quantity of lead in the brass it becomes brittle.
To brighten up shop-worm tin ware and make It look like new, dip a soft cloth in plaster-of-paris and rub the ware. Putz pomade is too expensive and too much trouble to get off. Almost all the other polishes contain more or less acid.
To produce a brilliant black upon iron and steel, apply with a fine hair brush a mixture of turpentine and sulphur which has been boiled together.
English Britannia metal is composed of:
16 24-100 parts Antimony,
1 84-100 parts Copper, 81 9-10 parts Tin. 14 6-100 parts Copper,
7 81-100 parts Antimony, 90 62-100 parts Tin.
31-10 parts Copper,
5-10 part Zinc, 6 3-10 parts Antimony, 90 1-10 parts Tin. 3 6-100 parts Zinc,
8 1-100 parts Copper,
9 66-100 parts Antimony, 85 4-10 parts Tin.
Copper 100 parts, tin 7 parts, lead 7 parts.
A brown fire-proof bronze for copper or brass is obtained by the dissolution of 11-12 drachms each of finely powdered sal-ammoniac and verdigris in one pint of water, the solution being allowed to stand covered 3 to 4 hours, at which time 1 1/2 additional pints of water are added. When bronzing a copper article, which must first be cleaned perfectly, it is to be held over a coal fire and heated to a uniform heat and color. Then cast the application of the solution, followed by careful drying. Tin copper is not to be heated sufficiently to melt the tin. Five or six such treatments of copper gives it a brass color, and from six to ten applications gives it a beautiful yellow tint. If a color shading from yellow into brown is desired for your article it must not be hot when the mixture is applied. This operation is to be repeated twenty to twenty-five times in order to give a light brown color.
A good, cheap bronze for use on the common kind of tea-trays is made by making into a paste with oil, and melting together 4 ounces borax, 4 ounces saltpeter, 2 drachms corrosive sublimate, 8 ounces flowers of zinc and 16 ounces of verdigris.
A good and permanent bronze can be made by melting together 96 parts copper and 4 parts tin. The following is a good bronzing liquid: Sal-ammoniac 1 drachm, oxalic acid 15 grains, vinegar 1 pint; mix. After well cleaning the article to be bronzed, warm it gently and brush it over with the liquid, using only a small quantity at a time. When rubbed dry repeat the application until the desired tint is obtained.