Two ounces best natural asphaltum (also called Egyptian asphaltum), worth about ten cents.
One and a half ounces best white virgin wax, worth about six cents.
One ounce Burgundy pitch, worth say five cents.
Break the wax into small pieces, and reduce the Burgundy pitch to fine powder in a mortar, or have it powdered at the drug-shop. Take a clean earthenware pot glazed on the inside, with a handle to it (in Boston you can buy one for fifteen cents at G. A. Miller & Co.'s, 101 Shawmut Avenue), and in this pot melt your asphaltum over a slow fire, taking very good care not to let it boil over, or otherwise you might possibly set the house afire. When the asphaltum has melted add the wax gradually, stirring all the while with a clean glass or metal rod. Then add the Burgundy pitch in the same way. Keep stirring the fluid mass, and let it boil up two or three times, always taking care to prevent boiling over! Then pour the whole into a pan full of tepid water, and while it is still soft and pliant, form into balls of the required size, working all the while under the water. If you touch the mass while it is still too hot, you may possibly burn your fingers, but a true enthusiast does not care for such small things. You will thus get about eight or nine balls of very good ground at an outlay of about thirty-six cents in cash, and some little time. Nearly all recipes order the wax to be melted first, but as the asphaltum requires a greater heat to reduce it to a fluid condition, it is best to commence with the least tractable substance. For use, wrap a ball of the ground in a piece of fine and close silk (taffeta), and tie this together with a string.
6. Means of heating the Plate.—Any source of heat emitting no smoke will do, such as a kitchen stove, a spirit lamp, or a small quantity of alcohol poured on a plate and ignited (when the time arrives).
7. A Hand Vice with a wooden handle, for holding the plate while heating it; price about seventy-five cents at the hardware-stores. But a small monkey-wrench will do as well, and for this experiment you can even get along with a pair of pincers.
8. A Dabber for laying the ground on the plate. Cut a piece of stout card-board, two or three inches in diameter; on this lay a bunch of horse-hair, freed from all dust, and over this again some cotton wool. Cover the whole with one or two pieces of clean taffeta (a clean piece of an old silk dress will do), draw them together tightly over the card-board, and tie with a string. When finished the thing will look something like a lady's toilet-ball. The horse-hair is not absolutely necessary, and may be omitted.
9. Means of Smoking the Ground.—The ground when laid on the plate with the dabber, is quite transparent and allows the glitter of the metal to shine through. To obtain a better working surface the ground is blackened by smoking it. For this purpose the thin wax-tapers known to Germans as “Wachsstock,” generally sold at German toy-stores, are the best. They come in balls. Cut the tapers into lengths, and twist six of them together. In default of these tapers, roll a piece of cotton cloth into a roll about as thick and as long as your middle finger, and soak one end of it in common lamp or sperm oil.
10. Stopping-out Varnish, used for protecting the back and the edges of the plate, and for “stopping out,” of which more hereafter. If you cannot buy it you can make it by dissolving an ounce of asphaltum, the same as that used for the ground, in about an ounce and a half of spirits of turpentine. Add the asphaltum to the turpentine little by little; shake the bottle containing the mixture frequently; keep it in the sun or a moderately warm place. The operation will require several days. The solution when finished should be of the consistency of thick honey.
11. Camel's-Hair Brushes, two or three of different sizes, for laying on the stopping-out varnish, and for other purposes.