This should be shook at intervals for twenty--four hours;
then add one ounce of chloride of iodine and three fourths
ounce of bromine.

Lime Water.--This is easily prepared by putting lime into water,
say a piece of quick-lime about the size of an egg into one quart of water.
This should be shook occasionally for two or three days and allowed to settle,
when the water can be poured off and used.

Use.--To one part of quick add six parts of water; coat to a light yellow
over the iodine, to a rose color over the quick, and recoat about one tenth.
The above coating may be increased or diminished, it matters not,
so that there is not too much, and the proper proportions are preserved.
Some add to the above a small quantity of magnesia, say about a teaspoonful
to the quart of liquid.

Liquid Accelerator, No. 2.--The following was for a long
time used by one of the first houses in the United States,
and probably was one of the first liquids ever used.
It produces a fine-toned picture, but is not considered as sure
as the lime water quick:

Take rain water one quart, add pulverized alum until it is a little sour
to the taste, and a small piece, say one half inch square, of magnesia.
Filter through paper, and add chloride of iodine one half ounce,
bromine sufficient to take it up, which is a little less than half an ounce.

Charge with one of quick to six of water; coat over iodine
to a soft yellow, nearly, but not quite, bordering on a rose;
over quick to a dark purple, or steel, and back one sixth