Set the deposit in the sun, or by a stove to dry.

When perfectly dry, pulverize, and it is ready for use.

With a little trouble you will obtain in this way a much better article than can generally be bought of dealers.

For the last washing, alcohol, or a mixture of alcohol and water, is preferable." Potassa Solution .-- The use of a solution of potassa in the preparation of the plate was suggested in the early history of the Daguerreotype.
It was thought to possess some peculiar property for improving the tone of the impression.

It is used for moistening the rotten stone in polishing the plate, and may be prepared by putting about an ounce and a half of alcohol in a close bottle, and add half a stick of caustic potash.