at the color you wish; and when the proof has been washed and dried,
in the manner previously explained, it will be found to be fixed,
without any stain, with a limpid surface, and an extraordinary warm tone.
If you were to augment the proportions of the ammonia or chloride
of gold, the operation would progress much quicker, but then the middle
of the proof would be always much clearer than towards the border.
The mixture may be used several times without being renewed.
It does not, however, give such a beautiful color to the impression
as when it is newly prepared. By communicating to the vessel containing
the solution a continual motion, the impression, when once immersed,
will be fixed. During that time, and while attending to anything else,
watch its color; and at the end of ten minutes or a quarter of an hour,
take it out of the bath and dry it.

Agent for Neutralizing Bromine, Chlorine, and Iodine Vapors.--
Aqua ammonia, sprinkled about the chemical or coating room,
will soon neutralize all the vapor in the atmosphere
of either chlorine, bromine, or iodine. No operator should
be without, at least, a six-ounce bottle filled with ammonia.
A little of its vapor about the camera-box has a decided and
happy effect. Burnt coffee, pulverized, has also the property
of destroying the vapors of the above chemicals, as also almost
any other agent employed about the Daguerreotype room.
Its deodorizing properties are such that if brought in
contact with air filled with the odor of decomposing meat,
it will instantly destroy all disagreeable smell.
It can easily be used in the Daguerreotype room by placing
a little of the raw bean, finely pulverized, on an old plate,
and roasting it over the spirit-lamp.