Mutton suet burnt on a polished surface produces a brilliant black which is very lasting. H. T. Millar.
To obtain a light bronzing fluid use nitric acid, 6 parts; nitric ether, 5 parts; alcohol, 5 parts; muriate of iron, 5 parts. Mix thoroughly and then add 10 parts sulphate of copper dissolved in 50 parts of water. O. G.
To prepare an enamel glaze for coating iron pans use flint glass, 130 parts; carbonate of soda, 20.5 parts; boracic acid, 12 parts. Dry at a temperature of 212 degrees and then heat to redness and anneal, that is, cool down very slowly.
Birmingham, Eng. W. R. Bowers.
Make an enamel by mixing 2 ounces of burnt umber with 1 quart boiled linseed oil, heating, and then adding 1 ounce asphaltum. Keep hot until thoroughly mixed, and thin with a small quantity of turpentine. Have the surface of the parts to be enameled thoroughly cleaned, and apply the enamel with a camel's hair brush, and allow it to set. Then place in an oven and bake for 6 hours, at a temperature of 250 degrees P. When cool, rub down with steel wool, and then apply the finishing coat of the desired color, and allow to bake for 6 or 8 hours. Rub down, when cool, with a soft cloth, then varnish and bake again at 200 degrees F. The heating and cooling should be done gradually each time so as not to crack the enamel. Black enamel usually requires a higher degree of temperature than any other kind, or about 300 degrees F.
Urbana, Ill. T. E. O'Donnell.