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.

Made slightly acid with nitric acid.

After sensitizing, the plate is exposed in the usual way and taken to