The first and indispensable operation, in the preparation of the surface
to receive the transfer, is the "sizing of the surface." It simply
consists of a solution of gelatine chrome-alumed, as follows:
Gelatine. 10 grains.
Water. 1 ounce.
A trace of chrome alum.
Coat with a soft camel's hair brush and let dry. It is needless to say
that numbers of _plaques_, plates, vases, etc., may be coated right off,
and will then be ready for use at any time.
Having settled on the subject and carefully dusted the negative, as well
as placed it _in situ_ for reproduction, the next thing required is a
suitable collodion, and the following will be found all that can be
desired:
TRANSFER COLLODION.
Cotton. 3 drachms.
Iodide of cadmium. 65 grains.
Ammonium iodide. 25 "
Bromide of cadmium. 19 "
Ammonium bromide. 11 "
Alcohol. 15 ounces.
Ether. 15 "
The plate thoroughly cleaned and coated with the collodion is now
transferred to a bath, as follows:
Nitrate of silver (common) 25 grains to the ounce.
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