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Transparent Green Varnish

A beautifully transparent green varnish is made by taking a small quantity of "Chinese it in 14 pounds cold water, triturating the lumps well; let it subside, and decant the clear fluid; add 7 pounds of water to the residue, and, when subsided, add the clear liquor to the other; precipitate this liquor with a solu- blue," with about twice the amount of finely tion of carbonate of soda, let the carbonate of powdered chromate of potash, and stirring lime settle, and decant the clear chloride of these in copal varnish thinned with turpensoda; wash the sediment out with water, and tine. A thorough grinding of this mixture add the clear liquid to the former, put it in a must be made for the purpose of intimately high stone jar, and give it a rotary motion incorporating the ingredients, as otherwise it with a wooden stick, pouring in at the same will not be transparent. A preponderance of time very diluted sulphuric acid, till it as- chromate of potash gives a yellowish shade sumes a greenish color and a smell of chlorine to the green, and a deficiency increases the is perceptible. Then add some of this liquid amount of blue. This varnish, thus colored, to the solution to be bleached, under constant produces a very striking effect in japanned stirring, till all the color is gone. French goods, paper-hangings, etc., and can be made polish will look like milk, Then precipitate very cheaply. with dilute sulphuric acid, exactly as the solu- 2942. Aniline Transparent Vartion for bookbinders' varnish, and treat the nishes. The aniline colors are particularly precipitate in the same manner, in hot water. well adapted for the manufacture of transpa- (See No. 2933.) All iron must be carefully rent lacs, which possess great intensity even avoided as soon as the chlorine liquor is add-in very thin films, and are hence very suitaed. Dissolve 1 pint of the above in 3 pints of ble for coloring glass or mica. The process 95 per cent. alcohol, and do not add any oil recommended by F. Springmuhl is to preof lavender, as in No. 2933. For photographs pare separately an alcoholic solution of this solution is too strong; 1 part of bleached bleached shellac or sandarach, and a concenshellac to 6 parts alcohol will answer. For trated alcoholic solution of the coloring matmaps the solution should not be applied im- ter, which last is added to the lac before using mediately to the paper, but the latter should it; the glass or mica to be coated being slight first receive a coat of boiled and strained ly warmed. Colored films of great beauty starch. may also be obtained, according to Springmuhl,

2936. Wax Varnish, or Milk of from colored solutions of gun cotton in ether, Wax. Pure white wax, 1 pound; melt the coloring matter being here dissolved in with as gentle a heat as possible, and warm alcohol and ether. The collodion film has its spirit of wine (90 per cent.), 1 pint; mix per- elasticity greatly increased by the addition of fectly, and pour the liquid out upon a cold some turpentine oil; and when applied cold, can be removed entire. The colored films may now be cut into any pattern, and again attached to transparent objects.