Читать книгу The Pyrotechnist's Treasury; Or, Complete Art of Making Fireworks - Thomas Kentish - Страница 9

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Put ¹⁄₂ an ounce of flake shellac into a tin pot, and pour upon it a quarter of a pint, or 5 ounces of methylated spirit; or, preferably, a like quantity of wood naphtha. Let it stand for about a day, stirring it occasionally till dissolved. Then half fill a basin with boiling water; set the tin containing the lac, in it, and leave it till it boils and curdles. If the water does not remain hot long enough to make it boil, set it in a second basin of boiling water. As soon as it has curdled, remove it; and when cold, pour it into a vial, and cork it. Spirit must never be boiled over a fire, nor near one, as the vapour might inflame. Keep the pot, therefore, while in the hot water, at a distance from a fire, or flame of a lamp or candle.