Best body copal varnish for coach-makers, &c
A Dictionary of Arts, Manufactures and Mines · 1840 · p. 1287
—This is intended for the body parts of coaches and other similar vehicles, intended for polishing. Fuse 8 lbs. of fine African gum copal; add two gallons of clarified oil (old measure); boil it very slowly for four or five hours, until quite stringy; mix with three gallons and a half of turpentine; strain off, and pour it into a cistern. As they are too slow in drying, coach-makers, painters, and varnish-makers, have introduced to two pots of the preceding varnish, one made as follows :— 8 lbs. of fine pale gum animé; 2 gallons of clarified oil; 3 1 ⁄ 2 gallons of turpentine. To be boiled four hours. Quick drying body copal varnish, for coaches, . (1.) 8 lbs. of the best African copal 2 gallons of clarified oil; 1 ⁄ 2 lb. of dried sugar of lead; 3 1 ⁄ 2 gallons of turpentine. Boiled till stringy, and mixed and strained. (2.) 8 lbs. of fine gum animé; 2 gallons of clarified oil; 1 ⁄ 4 lb. of white copperas; 3 1 ⁄ 2 gallons of turpentine. Boiled as before. To be mixed and strained while hot into the other pot. These two pots mixed together will dry in six hours in winter, and in four in summer; it is very useful for varnishing old work on dark colours, . Best pale carriage varnish. (1.) 8 lbs. 2d sorted African copal; 2 1 ⁄ 2 gallons of clarified oil. Boiled till very stringy. 1 ⁄ 4 lb. of dried copperas; 1 ⁄ 4 lb. of litharge; 5 1 ⁄ 2 gallons of turpentine. Strained, . (2.) 8 lbs. of 2d sorted gum animé; 2 1 ⁄ 2 gallons of clarified oil; 1 ⁄ 4 lb. of dried sugar of lead; 1 ⁄ 4 lb. of litharge; 5 1 ⁄ 2 gallons of turpentine. Mix this to the first while hot. This varnish will dry hard, if well boiled, in four hours in summer, and in six in winter. As the name denotes, it is intended for the varnishing of the wheels, springs, and carriage parts of coaches, chaises, .; also, it is that description of varnish which is generally sold to and used by house-painters, decorators, ., as from its drying quality and strong glo , it suits their general purposes well. Second carriage varnish. 8 lbs. of 2d sorted gum animé; 2 3 ⁄ 4 gallons of fine clarified oil; 5 1 ⁄ 4 gallons of turpentine; 1 ⁄ 4 lb. of litharge; 1 ⁄ 4 lb. of dried sugar of lead; 1 ⁄ 4 lb. of dried copperas. Boiled and mixed as before. Wainscot varnish. 8 lbs. of 2d sorted gum animé; 3 gallons of clarified oil; 1 ⁄ 4 lb. of litharge; 1 ⁄ 4 lb. of dried sugar of lead; 5 1 ⁄ 2 gallons of turpentine. To be well boiled until it strings very strong, and then mixed and strained. Mahogany varnish is made either with the same proportions, with a little darker gum; otherwise it is wainscot varnish, with a small portion of gold size. Black japan , is made by putting into the set-pot 48 pounds of Naples, or any other of the foreign asphaltums (except the Egyptian). As soon as it is melted, pour in 10 gallons of raw linseed oil; keep a moderate fire, and fuse 8 pounds of dark gum animé in the gum-pot; mix it with 2 gallons of hot oil, and pour it into the set-pot. Afterwards fuse 10 pounds of dark or sea amber in the 10 gallon iron pot; keep stirring it while fusing; and whenever it appears to be overheated, and rising too high in the pot, lift it from the fire for a few minutes. When it appears completely fused, mix in 2 gallons of hot oil, and pour the mixture into the set-pot; continue the boiling for 3 hours longer, and during that time introduce the same quantity of driers as before directed: draw out the fire, and let it remain until morning; then boil it until it rolls hard, as before directed: leave it to cool, and afterwards mix with turpentine.
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