The ferrotype and how to make it - The Grian Press

64
THE FERROTYPE.
first formula will produce a Collodion that will
cover a multitude of defects:
Iodide of Ammonium 30 grains;
Iodide of Sodium
10
Iodide of Cadmium
20
Bromide of Cadmium 20
1 Ether and Alcohol Soz.each;
Gun-cotton, (say)
GtoSgrs.
Or enough to make the Collodion as thick as may be, tc
flow evenly and smoothly over the plate.
I have found it highly beneficial to vary the
proportions according to the season. During cold
weather I use a greater proportion of ether, and
when the weather is very warm I use less ether
and more alcohol, ever varying the proportions
to suit the season. In the same way it is well to
use less bromide during the summer season, when
the sunlight is diffused—for instance, in July and
August it would be well to make up a sample
thus
:
Iodide of Ammonium 40 grains;
Iodide of Sodium
10
Iodide of Cadmium
30
Bromide of Cadmium
10
•Ether, (Cone.) ^ oz.
Alcohol
Gun-cotton, (in suitable quantity)..*
oi oz.
It may be well to observe that caution is nec-
essary in the use of an over proportion of alco-
hol, from the fact that it is likely to render th£
Collodion glutinous, and from its solubility in
water to sooner injure the bath. During cold
weather the proportions may be varied the other