2925. To Purify Dextrine

2925.     To Purify Dextrine. Hager gives a method for rendering dextrine pure, or at least freer from foreign odor and taste. For this purpose he dissolves 10 parts of good dextrine, with stirring, in 18 of cold distilled water, allows the mixture to stand for some days, decants and strains it from the sediment. The clear liquid is then to be mixed with once and a half to twice its volume of alcohol fortius (sec No. 1439); after some hours the liquor is separated from the pasty mass, which is then once more dissolved in a small quantity of water, and spread on glass or porcelain to dry at a temperature not exceeding 140° Fahr.

2926. Le Blond's Varnish

2926.    Le Blond's Varnish. Keep 4 pounds balsam of copaiba warm in a sand or water bath, and add 16 ounces copal (previously fused and coarsely powdered), by single ounces, daily, and stir it frequently. When dissolved add a little Chio turpentine.

2927. De Sylvestre's Dextrine Varnish

2927.   De Sylvestre's Dextrine Varnish. Dextrine, 2 parts; water, 6 parts: rectified spirit, 1 part. (Sec No. 2924.)

2928. Transfer Varnish

2928.     Transfer Varnish. For transferring and fixing engravings or lithographs on wood, and for gilding, silvering, etc. Dissolve 4 ounces mastich (in tears), and 4 ounces sandarach, in 11/2 pints rectified spirit; add 1/2 pint pure Canada balsam. (See No. 2919 (Mordant, or Transfer Varnish).)

2929. To Dissolve Amber

2929.    To Dissolve Amber. There is no difficulty in dissolving amber in chloroform, but people are apt to think they fail, from the circumstance that it is only partially soluble. Take some broken amber, reduce to a coarse powder, and place in a bottle with rather more than enough chloroform to cover them well; shake often, and in a few days, by pouring a drop or two of the clear liquid on a glass plate, a varnish of good body, which gives a strong glaze, may be obtained. Or an amber varnish may bo made as follows: Take of amber, 3 ounces; benzole, 50 ounces; heat the amber in a closed vessel to a temperature of about 570° Fahr. When it begins to soften and swell, emitting white fumes, then dissolve in the benzole.

2930. Amber Varnish for Photographs

2930.      Amber Varnish for Photographs. Dissolve 3 to 4 grains amber in 1 ounce chloroform. (See No. 2929 (To Dissolve Amber).)

2931. Brilliant Amber Spirit Varnish

2931.     Brilliant Amber Spirit Varnish. Fused amber, 4 ounces; sandarach and mastich, of each 4 ounces; highly rectified spirit, 1 quart. Expose to the heat of a sand-bath, with occasional agitation, till dissolved. (The amber is fused in a close copper vessel, having a funnel-shaped projection, which passes through the bottom of the furnace by which the vessel is heated.)

2932. Hare's Colorless Varnish for Photographs

2932.    Hare's Colorless Varnish for Photographs. Dissolve shellac by heat in 8 parts of water and 1 of pearlash. Precipitate by chlorine, and dissolve in rectified spirit. (See Nos. 2933 (Bookbinders' and Colorless Varnish) to 2935.)