Dissolve 3 lbs. of resin in 10 pints boiled Unseed oil, and add 2 lbs. of turpentine.
Clear Canada balsam, 4 oz.; turpentine, 8 oz. Warm gently and shake until dissolved. Maps, drawings, etc., which are to be varnished with this solution, should be first brushed over with a solution of isinglass and allowed to dry thoroughly.
Mastic, 6 oz.; turpentine, 1 quart. Tough, hard, brilliant and colorless. Excellent for common woodwork.
In order to make alcoholic varnish adhere more firmly to polished metallic surfaces, A. Morell adds one part of pure crystallized boracic acid to 200 parts of the varnish. Thus prepared it adheres so firmly to the metal that it cannot be scratched off with the finger nail; it appears, in fact, like a glaze. If more boracic acid is added than above recommended the varnish loses its intensity of color.
A good varnish can be made as follows: Mastic, six ounces; pure turpentine, one-half ounce; camphor, two drachms; spirits of turpentine, nine teen ounces; add first the camphor to the turpentine. The mixture is made in a water-bath, and when the solution is effected, add the mastic and the spirits of turpentine near the end of the operation, then filter through a cotton cloth. The varnish should be laid on very carefully.
A varnish for this purpose may be made of 120 parts resin, 180 sandarac, 50 gumlac. They should be heated gradually until melted, and thoroughly mixed, then 120 parts turpentine added, and subsequently, after further heating, 180 parts rectified alcohol. After careful filtration, it should be put into tightly-corked bottles.
Dissolve good shellac or seed lac in alcohol, making the varnish of any consistence desired. Note. - Shellac gives a pale cinnamon colored varnish. Varnish made with seed lac is deeper colored and redder. If colorless varnish is desired use bleached shellac, an article which is to be had at most drug stores.
Take good linseed oil, one gallon; amber, one-half pound; boil together until the fluid is brown and thick. Then strain through a cloth and boil again until of consistency of pitch, when it is fit for use. Having prepared this varnish well, clean the article to be japanned, and then brush the parts over with vermillion mixed with shellac varnish, or with drying oil diluted with turpentine. When this coat is dry, brush the whole with the amber varnish diluted to a proper consistency with turpentine, and then, when set firm, put the article into a hot stove to undergo heat for as long a time as required to produce the desired effect. In some instances as much as two weeks may be required, after which finish in an annealing oven.
Clear pale resin, 5 lbs.; turpentine, 7 lbs. Dissolve in any convenient vessel.