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Photography Without a Nitrate Of

SILVER BATH. (Sayce's process.) Preparation of Collodion. of ammonium, 2 grs.; soluble cotton, 6 grs.; ether Take of bromide of cadmium, 6 grs.; bromide and alcohol, each, oz.

Mix, and after standing a week, filter. Then take 12 grs. cryst. nitrate in fine powder; add to it a drop or two of water , so as to produce a kind of pulp. Then silver, stirring as the mixture is poured into the in a chemically dark room, mix the collodior and bottle intended for its reception. Then shake up well, and allow it to stand.

To use the Collodion in the Wet State. scratches; tip the edges for & of an inch with Take perfectly clean plate-glass, free from benzine. Then coat with the collodio-bromide of a solution of 1 gr. of India-rubber in 1 oz. of silver, allow it to set the usual time, and place it in a dish of water until the greasy appearance has vanished.

Warm water is preferable when it can be procured. When the water flows freely over the film, take the plate out of the dish, wipe blotting-paper. Then place in the dark slide for the back, and drain for a moment upon a piece of exposure in the camera. Expose a little longer than wet collodion, with the nitrate-bath. Wet the film with a little water, and pour over it protosulphate of iron, 25 grs .; glacial acetic acid, 25 minims; water, 1 oz. To 3 drs. of which, 2 drops of a 20 gr. solution of nitrate of silver.

Intensification may be accomplished by any of Fix with cyanide of potassium, 20 grs. to the oz. the means adapted to wet plates.

To use the Collodio-Bromide in the Preparation of Tannin Plates. and place them in a tank of water. Take the Coat the plates as directed in the last paragraph, last paragraph, in water as hot as the hand can bear, for about plates out of the tank in rotation, and place them 30 seconds, and then into a bath of tannin solution of 15 grs. to the ounce of water well filtered.

The following tannin solution is preferable: Tannin, 10 grs.; gallic acid, 5 grs.; water, 1 oz.; grape sugar, 5 grs.; alcohol, 10 minims. Dissolve the tannin in a portion of the water and filter; dissolve the gallic acid in another portion by the aid sugar, and when dissolved, filter; then add the of heat, and filter; mix the two, add the grape alcohol. If the plate be allowed to remain in the posed, very little intensification will be necessary. above solution three minutes, and is properly exis properly ex- Dry the plates evenly and quickly, and expose about half the usual time.

Development of the Dry Plates. water, each, oz.

Prepare the following solutions: 1. Alcohol and 2. Carbonate of ammonia, 40 grs. to water, 20 oz. 3. Pyrogallic acid, 96 grs. to alcohol, 1 oz. 4. Bromide of potassium, 10 grs. to water, 1 oz. 5. Nitrate of silver, 30 grs.; citric acid, 15 grs.; distilled water, 1 oz. of No. 1 to cover it, and return to the bottle for Pour over the dry plate once or twice, enough use in the next plate. Then place the plate in a dish of water until the greasy appearance has with a few drops of No. 3 and wo drops of No. 4 vanished.

Then pour evenly, enough of No. 2 added, and wave to and fro with a rocking motion.