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Metallic Soap

Metallic soap in linseed oil is highly recommended for coating canvas for wagon covers, tents, &c., as being not only impermeable to moisture, but remaining pliable for a long time without breaking. It can be made with little expense, with sufficient lime-water to neutralize the acid. For the best honey it takes 2 drachms.

This is merely a preliminary test to determino the necessary quantity of lime-water. A flocculent precipitate takes place, which readily separates, leaving the honey perfectly clear and of a very pale yellow color, like that of an old Rhine wine; the strained liquor must be perfectly neutral. From the quantity of lime-water necessary, the quantity of the whole lot of honey is calculated, and is then. treated as follows: 1 pound avoirdupois each of honey and water are heated, 4 grains powdered galls are added; the whole well stirred, heated to boiling, and the whole quantity of as follows: Soft soap is to be dissolved in hot lime-water added at once. The fire is immewater, and a solution of copperas (sulphate diately slackened and after a few minutes the of iron) added. The sulphuric acid combines with the potash of the soap, and the oxide of iron is precipitated with the fatty acid as insoluble iron soap. This is washed and dried, and mixed with linseed oil.

The addition of dissolved India rubber to the oil greatly improves the paint. 1563. Το Render Canvas Fire and Waterproof. Tents, awnings, canvas, &c., may be made fireproof as well as waterproof, by immersion in soluble glass diluted with boiling water to 25° Baumé. Before thoroughly dry, immerse in a solution of sulphate of alumina (alum cake) and sulphate of copper (blue vitriol), 1 part of each to 10 parts of water; then dry the fabric slowly in the air.