Dissolve 1 oz. nitrate of silver and 1 1/2 oz. of carb. soda in crystals, separately in distilled water; mix the solutions, collect and wash the precipitate on a filter, introduce the washed precipitate, still moist, into a Wedgewood mortar, and add to it tartaric acid 2 drs. 40 grs., rubbing together till effervescence has ceased; dissolve carmine 6 grs. in liquor ammoniAe (.882) 6 oz., and add to it the tartrate of silver, then mix in white sugar 6 drs., and powdered gum arabic 10 drs., and add as much distilled water as will make 6 oz. - Pharm. Journal.
This is usually made by boiling linseed oil in a large iron pot, setting fire to it, and letting it burn for half an hour or more. Various additions are made to it by some manufacturers, the use of which is not very evident. A viscid varnish is obtained, which is ground with lamp-black, vermilion, or other colouring matters, till perfectly smooth. 2 1/2 oz. of lamp-black are sufficient for each pound of varnish. See Varnishes.
This is not rendered so viscid as the former, and is coloured with Frankfort black.
The blue consists of his soluble Prussian blue (see Blue Writing Ink, further back) ground with oil as above. The black, by evaporating his black ink, and mixing the product with oil as usual. The red in the same manner, from his patent red ink.
Insect bites, to cure. Camphor, and pepper, may be used to keep off moths. In Russia the powder of the flowers of a species of Pyrethruni is used as an insecticide. The powder of Pyrethrum roseum, or a diluted tincture, prevents mosquitoes from biting in the East Indian islands. The powder of the root of Acorns calamus is also recommended. Liquid ammonia, sulphate of copper, or a mixture of toilet vinegar and glycerine, are good as applications to bitten parts. Also a powder consisting of carbonate of lead 1 part, chalk 4 parts.
Fuse iodide of potassium in a capacious Hessian crucible, remove it from the fire and add to it, while still semi-fluid, successive portions of pulverized chlorate of potash, stirring after each addition, till no further action takes place. One part of iodide of potassium will require 1 1/2 of the chlorate. Wash the residium in warm water, which leaves only iodate of potash.
See Potassii Iodidum, Pocket Formulary.
See Dyes, further back.
Ferri Persulph. See Pocket Formulary.
Burn shavings and waste pieces of ivory from the ivory turners, in a covered crucible, till no more smoke issues. Cover it closely while cooling. It should be afterwards washed with diluted hydrochloric acid, then with water till no longer acid, dried, and again heated in a covered crucible. It is of a deeper colour than bone-black, and is used as a pigment, a tooth-powder, and to decolorize syrups and other liquids.