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Cess

Cleaning the Glasses. place the surface water of the washed collodion film. Then apply a second quantity.

Stand the albuminized plates vertically on blot ting-paper to drain and dry.

The Aceto-nitrate Bath.

Take an ordinary collodion negative bath and add to each fluidounce 30 minims of glacial acetic acid, keep it in glass or gutta percha and continue to use it until it has become blackened by the acit until it has become blackened by the action of the albumen. The film of albumen must be rendered quite dry by holding it to the fire before it is dipped in the aceto-nitrate bath. Leave them in the bath any time between 30 seconds and 2 minutes, and then remove the wash with water. Use two dishes for washing and allow 20 or 30 seconds in each dish; then rear up again to dry, and the plates will be ready for exposure.

Artificial heat may be used with advantage.

The most successful operators in Taupenot's process give a very long exposure.

Development.

Prepare a saturated solution of gallic acid in Fildistilled water, adding 4 grs. to each oz. ter this developer through paper.

The solution of nitrate of silver for use with the gallic acid may be made of the strength of 20 grs. to the ounce.

Add 15 minims to 1 oz. of gallic acid solution.

Previous to the application of the developer the surface of the film must be moistened with water.

From half an hour to an hour must be allowed for the full development with gallic acid. F with a saturated solution of hyposulphite.