The ferrotype and how to make it - The Grian Press

COLLODION. 6;j
"Double Iodides, 5 to 6 grains to oi.
Double Bromides, or
Bromide of Cadmium 2J grains to oz.
Alcohol and Ether (equal parts)
Cotton about 6 grains to oz.
" I believe the double iodides to be far superior
tc the simple iodides. I should like to have others
try tliem, and should like to hear what they think
of them."
The two following formulas will produce the
best Collodion for Ferrotypes I have ever used,
and I would recommend them as worthy of trial
by every Ferrotypist who shall read this book.
The first I have used for fully eight years ; the
second I have lately adopted
Alcohol and Ether 5 ozs. each.
Gun-cotton, to make of suitable consist-
ency, to be immersed in Ether before
the Alcohol is added :
To every 10 ozs. of plain Collodion add
Iodide of Ammonium 40 grains;
Iodide of Cadmium .,...* 20 grains;
Bromide of Cadmium 20 grains.
This Collodion can be used as soon as it has
settled sufficiently clear, and will keep exceedingly
well. The other is equally good, but in some
respects it is different, requiring more skill in its
use. It is more transparent than the first, and
will not, therefore, cover the defects on the sur-
face of the plate ; in fact it can not be used on
plates which have been cleaned, or that are
scratched or stained on the surface, whereas the
: