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Wa′ter-proof′ing Pa′per.

Szerlmley's process is as follows: a, 30 ounces of glue, gelatine, or size, and 3 ounces of gum-arabic, are melted in 10 pints of hot water; b, 20 ounces of soap and 4 pounds of alum are also melted in 30 pints of hot water, and the compounds a and b are mixed, constituting composition No. 1. 1/2 gallon benzole and 1 gallon paraffine oil are mixed and heated, and 24 ounces resin melted in; to these, resin, oil, and copal, or mastic varnish, may in some cases be added; the whole is boiled to a moderate degree of consistency, forming composition No. 2. The article to be water-proofed is dipped in composition No. 1 and dried, and afterward composition No. 2 is applied with a brush or in other convenient manner.

A water-proof packing-paper is made by first coating the paper with a resinous liquid; it is then painted over with a solution of glue and soot; when this is dry, the water-proofing compound is applied with a brush. This is prepared by dissolving 2 1/2 ounces of shellac in 2 pints of water, which is gradually brought to a boiling heat, the shellac being stirred until thoroughly dissolved and softened, when 1/2 ounce pulverized borax is gradually added, until the whole becomes intimately incorporated. While hot, any mineral color, as lampblack, red or yellow ocher, or umber, may be added; when cold, it is ready for use.

Another recipe for water-proofing paper is to pass the paper rapidly over and in contact with the surface of a solution of oxide of copper in ammonia. It is then drawn in succession between two pressing-cylinders and two drying-cylinders. The solution slightly dissolves the cellulose of the paper, converting it into an impermeable varnish.

Another recipe consists in soaking good paper in an aqueous solution of shellac and borax. It resembles parchment-paper in some respects. If the aqueous solution be colored with aniline colors, very handsome paper, of use for artificial flowers, is prepared.

1877.

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