Collodio chloride is a collodion emulsion, consisting of plain collodion and silver chloride. It is a grayish-white substance in liquid form, and being quite sensitive to light, it must be kept in a covered bottle.

Anthony's collodio chloride is supplied in 8-ounce or larger bottles, and will keep indefinitely. The formula for its preparation is not known, but it is sold at a price that renders its preparation by individuals unprofitable.

The following.formula will give a superior quality of collodio chloride to those wishing to make their own.

Formula For Collodio Chloride

No. I. Nitrate silver.......... 1 drachm.

Water................ 1 dram.

No. 2. Chloride of calcium. ... 64 grains. Alcohol............... 2 oz.

No. 3. Citric acid............64 grains.

Alcohol............... 2 oz.

To 2 oz. plain collodion add of

No. 1.........................30 drops.

No. 2......................... 1 dram.

No. 3.........................½ dram.

By the use of this emulsion most beautiful pictures may be made on paper and upon porcelain, opal, stoneware, and other plain white surfaces.

When paper or any other flexible surface is to be used, it is simply coated with the emulsion. First place the paper flat upon a square of glass and pour upon it the emulsion, causing it to flow evenly over the whole surface and the excess to flow back into the bottle from the lower corner. This must be done in a subdued light, but not necessarily in a dark room or by non-actinic light, as in the case of the use of gelatine bromide paper.

When the paper is coated it should be placed in a closet or some dark place to dry, and when dried it is printed in the same manner as silver paper, by placing it in a printing frame in contact with a negative. It is printed by sunlight, and may be examined while printing, to see the progress made. The printing should be carried a shade or two beyond the color suitable fur a finished print, and when done should be washed in clean water and toned with gold, and afterwards fixed in hyposulphite soda and again well washed in the same manner as for silver prints.

Flat porcelain or other enameled surfaces, before being coated with the emulsion should be albumen-ized in the same manner as glass plates for the collodion process.

The white of an egg to 6 ounces of water, well beaten, will be the most suitable proportion for this purpose.

For printing on porcelain or other enamel plane surfaces, specially prepared printing frames are necessary in order that the progress of the printing may be ascertained.

All articles with uneven surfaces, such as plaques, plates, saucers, of porcelain china or stoneware, that cannot be placed in printing frames, may have pictures printed on them by the aid of the Solar Camera or by Anthony's Enlarging Camera, and the lime or the magnesium light.

See Anthony's Enlarging Camera.