2948. Flexible Varnish for Balloons, etc

2948.    Flexible Varnish for Balloons, etc. Digest cold, 11/2 ounces India-rubber, cut small, in 1 pint of either chloroform, sulphuric ether (washed), or bisulphuret of carbon. This dries as soon as laid on.

2949. India-Rubber Varnish

2949.    India-Rubber Varnish. Digest in a closed vessel, at a gentle heat, 1 ounce India-rubber shavings in 1 pint of rectified mineral naphtha, or benzole; then strain it. This dries very badly, and never gets perfectly hard.

2950. Tough India-Rubber Varnish

2950.    Tough India-Rubber Varnish. Dissolve by heat 1 ounce India-rubber in 1 quart of drying oil. This dries very tough in about 48 hours.

2951. Flexible Varnish

2951.    Flexible Varnish. Boil 3 ounces dried white copperas, 3 ounces sugar of lead, and 8 ounces litharge, in 1 gallon linseed oil; stir constantly until it strings well, then cool slowly and decant the clear portion. If too thick, thin with quick-drying linseed oil.

2952. Colpin's India-Rubber Varnish

2952.   Colpin's India-Rubber Varnish. India-rubber in small pieces, washed and dried, are fused for 3 hours in a close vessel, on a gradually heated sand-bath. On removing from the sand-bath, open the vessel and stir for 10 minutes, then close again, and repeat the fusion on the following day, until small globules appear on the surface. Then strain through a wire sieve.

2953. Metallic Varnish, or Var-nisher's Amalgam

2953. Metallic Varnish, or Var-nisher's Amalgam. Melt 4 ounces grain tin (see Index) with 1 ounce bismuth; add 1 ounce quicksilver, and stir till cold; then grind it very fine with white of egg or varnish, and apply this metallic varnish to the figure to be coated.

2954. Varnish for Gun Barrels

2954.    Varnish for Gun Barrels. The varnish used for gun barrels, after they are bronzed, is made by dissolving 1 ounce of shellac and 1 or 2 drachms of dragon's blood in a quart of alcohol, and filtering the solution through blotting paper into a bottle, which must be kept closely corked. This varnish, being laid on the barrel, and become perfectly dry, must be rubbed with a burnisher to render it smooth and glossy.

2955. Submarine Varnish

2955.    Submarine Varnish. Resin, 2 parts; galipot, 2 parts ; essence of turpentine, 40 parts. Melt the above, and add, in the form of very fine powder, and well mixed, sulphide of copper, 18 parts; regulus of antimony, 2 parts. This varnish is said to protect wood from worms, and to prevent the adherence of barnacles and parasites to the bottom of ships. It also preserves iron from oxidation.

2956. Varnish for Iron

2956.    Varnish for Iron. The following is a method given by M. "Weiszkopf, of producing upon iron a durable black shining varnish: Take oil of turpentine, add to it, drop by drop, and while stirring, strong sulphuric acid, until a syrupy precipitate is quite formed, and no more of it is produced on further addition of a drop of acid. The liquid is now repeatedly washed away with water, every time renewed after a good stirring, until the water does not exhibit any more acid reaction on being tested with blue litmus paper. The precipitate is next brought upon a cloth filter, and, after all the water has run off, the syrupy mass is fit for use. This thickish deposit is painted over the iron with a brush; if it happens to be too stiff, it is previously diluted with some oil of turpentine. Immediately after the iron has been so painted, the paint is burnt in by a gentle heat, and, after cooling, the black surface is rubbed over with a piece of woolen stuff dipped in, and moistened with linseed oil. According to Weiszkopf, this varnish is not a simple covering of the surface, but it is chemically combined with the metal, and does not, therefore, wear or peel off the iron, as is the case with other paints and varnishes.