coating be too light, then an undue proportion of bromine is used
in order to bring it to the second standard, and vice versa."

The iodine box should be kept clean and dry. The plate immediately
after the last buffing, should be placed over the iodine, and the coating
will depend upon the character of the tone of the impression desired.
Coating over dry iodine to an orange color, then over the accelerator,
to a light rose, and back over iodine one sixth as long as first coating,
will produce a fine, soft tone, and is the coating generally used for
most accelerators. The plate iodized to a dark orange yellow, or tinged
slightly with incipient rose color, coated over the accelerator to a deep
rose red, then back over iodine one-tenth as long as at first coating,
gives a clear, strong, bold, deep impression.

I will here state a singular fact, which is not generally known
to the operator. If a plate, coated over the iodine to a rose red,
and then exposed to strong dry quick or weak bromine water,
so that a change of color can be seen, then recoated over the iodine
twice as long as at first coating, it will be found far more
sensitive when exposed to the light than when it has been recoated
over the iodine one-fourth of the time of the first coating.

Probably the best accelerating combination is the American
compound formerly known as "Gurney's American compound,"
or some of the combinations of bromide of lime.
The first is thought to possess perhaps more uniformity in its
action than any other combination I have ever used.

The plate once coated should be kept excluded from the light
by means of the plate holder for the camera box.