Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 127
Mucilages: For Affixing Labels To Glass And Other Objects.
Оглавление—I.—The mucilage is made by simply pouring over the gum enough water to a little more than cover it, and then, as the gum swells, adding more water from time to time in small portions, until the mucilage is brought to such consistency that it may be easily spread with the brush. The mucilage keeps fairly well without the addition of any antiseptic.
| II.— | Tragacanth | 1 ounce |
|---|---|---|
| Acacia | 4 ounces | |
| Thymol | 14 grains | |
| Glycerine | 4 ounces | |
| Water, sufficient to make | 2 pints |
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Dissolve the gums in 1 pint of water, strain and add the glycerine, in which the thymol is suspended; shake well and add sufficient water to make 2 pints. This separates on standing, but a single shake mixes it sufficiently for use.
| III.— | Rye flour | 8 ounces |
|---|---|---|
| Powdered acacia | 1 ounce | |
| Glycerine | 2 ounces | |
| Oil of cloves | 40 drops | |
| Water, a sufficient quantity. |
Rub the rye flour and the acacia to a smooth paste with 8 ounces of cold water; strain through cheese cloth, and pour into 1 pint of boiling water and continue the heat until as thick as desired. When nearly cold add the glycerine and oil of cloves.
IV.—One part, by weight, of tragacanth, when mixed with 95-per-cent alcohol to form 4 fluidounces, forms a liquid in which a portion of the tragacanth is dissolved and the remainder suspended; this remains permanently fluid, never deteriorates, and can be used in place of the present mucilage; 4 to 8 minims to each ounce of mixture is sufficient to suspend any of the insoluble substances usually given in mixtures.
V.—To 250 parts of gum-arabic mucilage add 20 parts of water and 2 parts of sulphate of alumina and heat until dissolved.
VI.—Dissolve 1/2 pound gum tragacanth, powdered, 1/4 pound gum arabic, powdered, cold water to the desired consistency, and add 40 drops carbolic acid.
