as first coating.

Gurneys American Compound.--Of this compound there are two combinations,
one for use, when the temperature of the atmosphere is above 65 or 70
deg., and the other at a lower temperature. The first is called No. 1,
the second No. 2.

No. 1 is prepared by placing hydrate of lime in a bottle,
say to three quarts of the hydrate of lime, add one ounce
of pulverized burnt alum, and as much chloride of lime as can
be put on a quarter of a dollar, and from l5 to 30 grains
of dry pulverized iodine, or enough to change the color of
the hydrate of lime, to the slightest possible tinge of yellow.
There had better be less than carry the color to a deeper shade.
The object of using the iodine is to form a compound with
bromine that is not so volatile as the bromine itself.
No matter how little iodine is combined with the bromine,
the vapors possess their relative proportion; hence, only enough
iodine to prevent "flaring," or as it is often termed
a "scum-coating," is used. The iodine should be thoroughly
combined with the lime, which will take about one or two days.
Should add bromine the same as in bromide of lime,
until the compound assumes a light red color.

No. 2 is prepared in the same manner as No. 1, except the addition
of the iodine, which is omitted.

Use.--No. 1. Coat over the iodine to a bright yellow color,
then over the compound, No. 1, to red color, recoat over iodine,
about one sixth as long, as the time occupied in first coating.