Green Transparent Varnish

Thin some copal varnish with turpentine, grind well together equal quantities of Chinese blue and chromate of potash, and mix them thoroughly with the diluted varnish.

The precise shade of green may be varied by the different proportions in which the Chinese blue and chromate of potash are used.

For Venetian blinds, give the wood a couple of coats of light lead-color, and allow it to become perfectly hard. Grind some dry white lead in spirit of turpentine, and add to it one-third of its quantity of verdigris or navy green, which has previously been ground in oil, to this mixture add sufficient common oak varnish to bind the color. Two, or if required, three coats of this varnish are now to be applied, and as it dries very rapidly the whole may be finished in a few hours.

To Remove Varnish From Pictures Or Fine Work

By friction, if it be a soft varnish such as that of mastic, the simple rubbing of the finger ends, with or without water, may be found sufficient, a portion of the resin attaches itself to the fingers, and by continuous rubbing removes the varnish. If it be hard varnish such as that of copal which is to be removed, friction with sea or river sand, the particles of which have a rotundity that prevents their scratching, will accomplish the purpose. The solvents commonly employed for removing varnish are the several alkalies, alcohol and essential oils used simply or combined. Of the alkalies, the volatile in its mildest state, or carbonate of ammonia, is the only one which can be safely used in removing dust, oil, and varnish from a picture, which it does powerfully, it must, therefore, be much diluted with water, according to the power required, and employed with judgment and caution, stopping its action at the proper time by the use of pure water and a sponge. A thick coat of wet fuller's earth may be employed with safety, and, after remaining on the paint a sufficient time to soften the extraneous surface, may be removed by washing.

Both pictures and gilding have been restored to their original beauty by the application of wet clay.

Varnishes For Engravings, Paints, And Maps

A piece of plate glass is heated, and while yet warm a little wax rubbed over it, water is then poured over the plate, the moistened picture laid thereon and pressed closely down by means of a piece of filtering paper. When dry the picture is removed, and will be found to possess a surface of great brilliancy, which is not injured by the process of mounting. Boil Chio turpentine till brittle, then powder and dissolve in oil of turpentine. Canada balsam and clear white resin of each 6 ounces, oil of turpentine 1 quart, dissolve. Digest gum sandarach 20 parts, gum mastic 8 parts, camphor 1 part, with alcohol 48 parts. The map or engraving must previously receive one or two coats of gelatine.