Collodion For Porcelain Pictures.

1. - Negative Gun - Cotton,..................

60 grains

Alcohol,..................

2 ounces

Ether,..................

3 ounces.

Put three ounces of pure alcohol in a small bottle, add to this 120 grains of nitrate of silver, very finely powdered. Set the bottle in water, and heat to boiling - point; keep it there until all the silver is dissolved in the alcohol. As soon as this is done, pour the silver solution, still hot, into the collodion, stirring up all the time to secure a perfect solution.

2. - Chloride of Strontium,..................

32 grains,

Citric Acid,..................

. 24 "

Reduce to a fine powder, and dissolve in four ounces alcohol; add Ether,

4 ounces.

Gun - Cotton,..................

60 grains.

These two collodions will Keep for any length of time, and when mixed in equal proportions will produce brilliant prints. - George H. Fennemore.

To Print on Porcelain. - Coat the porcelain with albumen from fresh eggs and water, equal quantities. After the plate has dried (without heat), warm it and let it cool again. Coat with the collodion (mixture of Nos. 1 and 2), in a moderately dark room, and dry the plate perfectly over a spirit - lamp. Lay the negative on the prepared porcelain, being sure to have it in the right place; protect the back of the porcelain with yellow paper, and put plenty of patent clothes-clips all around the edge to secure a good contact.

Toning Porcelain Prints. - Wash first in plain water, next in water containing a very little salt. Tone in

Water,.......................

8 ounces.

Gold Solution (1 grain per ounce strong),

1 drachm.

After toning and washing, fix in

Hyposulphite of Soda,.......................

1 ounce.

Water,..............................................

10 or 12 ounces.

G. Schreiber.