Plain Pyro Developer

The strength of this may vary from 1 to 5 grs. in an ounce of water. Two grains may be taken as a medium. The dry plate being flooded with alcohol and water, and washed so as to well wet the film, this solution is floated over it.

Pour this over the wetted plate, allow it to remain on a few seconds only, and then pour back into the developing cup, and add to it 5 minims of solution No. 2 and apply again.

The Collodio-Albumen Dry Process

Mr. Mudd. - In this process the ordinary bromo-iodized collodion is employed. The plate being sensitized, is washed well, first with distilled, then with common water, and placed in a dish half filled with solution of iodide of potassium (3 grs. to the ounce), and allowed to remain while the next plate is being prepared. It is then removed from the solution and well washed with clean water, after which the following solution is poured over its surface:

Introduce these materials with some pieces of broken glass into a bottle capable of holding twice the quantity, and agitate till the whole forms a froth, and then, when settled, it is ready. A piece of camphor placed in the solution will help to preserve it. It must be filtered before using. After the plate has been coated with the above, it is finished by drying before the fire.