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Lea's Solution for Cleaning camera

Develop the image by brushing Photographic Glasses. Water, 1 pint; over it the following powder: Oxide of cobalt, sulphuric acid, 1/2 ounce; bichromate potash, 180 parts by weight; black oxide of iron, 90 1/2 ounce. The glass plates, varnished or parts; red lead, 100 parts; sand, 30 parts. otherwise, are left, say 10 or 12 hours, or as Decompose the bichromate by immersion in a much longer as desired, in this solution, and bath formed of water, 100 parts by weight, then rinsed in clean water, and wiped or hydrochloric acid, 5 parts. Wash it in clean rubbed dry with soft white paper. This pre- water and dry it; and lastly, vitrefy the proof paration is by Mr. Carey Lea, of Philadelphia, on a clean piece of cast iron, the surface of and is said to be the best in use. It quickly which has been previously chalked. One removes silver stains from the skin without minute will suffice for indelibly fixing and any of the attendant dangers of the cyanide glazing the photograph, which must be careof potassium. fully and slowly allowed to cool. Photographs on enamel of any size, taken in this manner, are perfectly unalterable under all atmospheric conditions, and may consequently and aptly be called everlasting photographs. 3165. Searing's Process for Photo- 3161. Wenderoth's Photographic Varnish. Nearly all photographic varnishes reduce the intensity of the negative. Mr. F.

A. Wenderoth, of Philadelphia, states that if a thin solution of gum-arabic is applied to the negative after fixing and before drying, the graphing on Wood for Engraving. varnish will not affect the intensity. This is The block on which the picture is to be mace a very simple and useful remedy. Mr. Wen- is first dampened with water, then whitened deroth also states that he has long practiced with enamel rubbed from the surface of good the covering of photographic paper prints upon both sides with collodion varnish, and finds it a complete preservative of the picture.

Nearly all photographs will fade away in a few years unless thus protected. 3162. Collodion Varnish for Photographic Prints. A very effective and agreeable polish is communicated to card or enameled visiting cards. Rub gently, emoving only the enamel, after which it is brushed smooth with a moderately stiff brush, from right to left and up and down, making a smooth, even, and very thin surface. Allow this to dry, after which it is flowed with a solution of albumen, made with the white of 1 egg and 16 ounces of water, dried by heat' or allowed to dry spontaneously. Now coat and dried. It is then brushed over on one it with another albumen solution made as side (which should be marked near the edge) follows: White of 1 egg; water, 4 ounces; with the solution of nitrate of silver, and chloride of ammonia, 40 40 grains. Beat the dried at the fire. The stronger the solution, whole to a thick froth. Allow to subside, the more sensitive the paper. If the barytic then decant or filter through a fine sponge solution (see No. 3181) be used instead of placed in a glass funnel. Pour a sufficient common salt, richer shades of color are obquantity on one corner of the block to cover tained. A solution of 10 grains sal ammoniac it, when spread around with the aid of a or in 1 ounce water gives a very sensitive paper. glass (using the edge). Allow the surplus A due proportion must be observed in the solution to drain back into the bottle. Dry this by a gentle heat. Next flow on, in the dark room, solution No. 3, prepared as follows: Ether, 1 ounce; alcohol, 1 ounce; gun-cotton, 8 grains; nitrate of silver, 30 grains; dissolve in as small a quantity of water as possible, and allow to settle for a few days, protected from the light. Again dry the block by gentle heat. It is now ready for silver and salt solutions, as follows: grains common salt to 1 ounce water; and

Sensitive paper for the camera, use 50 120 grains nitrate of silver to 1 ounce water.

Or: 60 grains of the nitrate with 40 grains muriate of ammonia, and 4 ounces water.

Or: 100 grains nitrate with the barytic solution. (See No. 3181.) exposure under the negative. A porcelain botanical and entomological specimens, &c. Less sensitive, for copying engravings, printing-frame, or any other suitable method, The salt solution to contain 25 grains salt to may be used to print it. After printing, 1 ounce water. The silver solution 90 grains solution No. 3 is removed from the surface of in 1 ounce water. the block by dissolving in ether and alcohol, Forcopying lace-work, feathers, patterns, &c. assisted by rubbing gently with a soft sponge.

The picture can now be toned and fixed in the ordinary way, or fixed and toned at one operation, by the hypo and gold bath. After being allowed to dry, it is ready for the engraver.

The salt solution, 20 grains; the silver solution, 40 grains to 1 ounce. To fix the drawing on these papers, they must be first washed in lukewarm water, then dipped twice in solution of hyposulphite of soda (1 ounce to 1 pint), then in pure water, and dried. 3166. Το Recover Silver from Photo- 3171. Iodized Paper. Brush over the graphic Waste. To obtain the silver from paper on one side (which should be marked) a photographic bath, or from the rejected with strong solution of nitrate of silver (100 photographs and clippings, is a most im- grains to 1 ounce); then dip it in solution of portant measure of economy in the art.

The iodide of potassium (25 grains to 1 ounce); bath should be filtered, and a solution of wash it in distilled water, drain, and dry it. common salt added; this precipitates chloride of silver, which is to be collected on a filter, in solution of bromide of potassium (40 grains