of iodine. In mixing it, much depends upon the strength of
the ingredients; an equal portion of each being generally used.
Perhaps the best method of preparing it, is to make a solution in
alcohol of half an ounce of chloride of iodine, and add the bromine
drop by drop, until the mixture becomes of a dark red color;
then dilute with distilled water, till it assumes a bright yellow.
Put about half an ounce of this compound into the pot, and coat
over it to a violet color, change the solution when it becomes
too weak to produce the desired effect.

Another.--Mix half an ounce of bromine with one ounce of chloride
of iodine, add two quarts pure distilled water, shake it well and let
it stand for twelve hours then add twenty-five drops of muriatic acid,
and let it stand another twelve hours, occasionally shaking it up well.
Dilute six parts of this solution in sixteen of water. Coat over dry
iodine to a deep yellow, then over the sensitive to a deep rose color--
approaching purple--then back, over dry iodine from four to eight seconds.

Roach's Tripple Compound.--This is one of the very best
sensitive solutions, and is very popular among Daguerreotypists.
To use this, take one part in weight, say one drachm,
of the compound and dilute it with twelve of water; coat over
dry iodine to yellow, then over the compound to a rosy red.
The effect in the camera is quick, and produces a picture
of a fine white tone.

Gurney's Sensitive.--This is another preparation of bromine,
and gives a fine tone. To two parts of water add one of
the sensitive, and put just sufficient in the box to cover
the bottom, or enable you to coat in from eight to ten seconds.