A mixture of 20 parts of carbonate of soda. 11 of boracic acid, and 125 of broken (flint) glass and melted, and the mass poured out on a stone or plate of metal. When cold it is pulverized and mixed with a silicate of soda (water glass) solution of 50 degrees Fahr. The metal is covered with this paste and then heated until it melts. This enamel is said to adhere well to iron and steel.
To fix a metallic to a soft substance requires a tough substance, not a varnish, nor yet a glue, but India-rubber cement. Warm the metal and rub over with the cement, and when yet hot, apply the cloth and press with a hot flatiron.
Labels can be glued on tin boxes, etc., exposed to moisture, by the following process, and they will not come off, even if dipped or allowed to remain in water.
The white of an egg should be mixed with half as much water, or the dessicated albumen of commerce dissolved in two or three times its weight in water. Apply with a brush to the surfaces to be united, then iron with a very hot flatiron. Several layers of paper and glue thus treated will render any box or anything of the kind impermeable to water.
To glue leather to iron, paint the iron with some kind of lead color, say that and lampblack; when dry cement with a cement made as follows: Take the best glue, soak it in cold water till soft, then dissolve in vinegar with a moderate heat, then add one-third of its bulk of pure turpentine, thoroughly mix, and by means of the vinegar make it of the proper consistency to be spread with a brush, and apply it while hot; draw the leather on quickly and press it tightly in place. If a pulley, draw the leather around as tightly as possible, lap and clamp.
Gold bronze powder, such as is used for decorating furniture, tinware, etc., is composed of bisulphate of tin. It may be mixed with copal varnish for application.
A superior gold bronze iron is obtained by the dissolution of 3 ounces of finely powdered shellac in 1 3/4 pints of spirits of wine. This varnish is to be filtered through linen and with the filtrate you must triturate enough Dutch gold to give is a lustrous appearance. Brush the iron previously polished and heated over with vinegar, and apply the color with a brush. After it is dry coat the article with a mixture of copal and amber lacquer.
A gold-colored surface on brass may be produced with a liquid prepared by boiling together for about fifteen minutes 4 parts of caustic soda, 4 parts of milk sugar, and 100 parts of water, to which 4 parts of a concentrated solution of sulphate of copper should then be added with constant stirring. The mixture is then cooled to 67 degrees Fahr., and the well-cleansed articles are immersed in it for a short time, when the gold color will appear. A longer immersion results in the formation of a bluish green tint, and a still more prolonged action causes the formation of iridescent colors.