To use Bromine Water or other Accelerators in Hot Weather.--
An excellent plan for using bromine water is as follows:

Fill a two-ounce bottle quarter full of it, and then fill the bottle
with fine sand, which serves to preserve a low temperature;
then place the bottle in a porous cup, same as used in the battery;
fill this also with sand, and close the end with plaster of Paris.
Place this in a coating-box, and it will be found to act with great
uniformity and be quite permanent.

Bromide of Lime, another accelerator, can be used in the same manner,
except it is, only necessary, when a solid sensitive is used,
to mix it with the sand without placing it in a bottle.
This method is employed with great success by a few, who have
regarded it as a secret worth keeping.

A Combination, requiring the Use of only One Coating-box.--
It is often wondered by beginners, why some solution requiring only
one coating cannot be employed. This can be done, but the results
are not so satisfactory as when two or more are employed.
Such an accelerator may be produced by adding alcoholic
solution of iodine to a solution of chlorate of potash,
until the latter will take up no more of the former,
and to each ounce, by measure of this solution, ten drops
of a saturated solution of bromide in water are added.
The solution of chlorate of potash is made by diluting, one part
of a saturated solution of the salt with ten parts of water.
The use of the chlorate is simply as a solvent of iodine.

Fats as Accelerators.--The use of fats, oils, or greasy substances,