The ferrotype and how to make it - The Grian Press

DEVELOPER AND DEVELOPMENT. 96
not be added at all, if the solution flows readily
on the plate ; it is, however, better to add it at
once to make sure.
To use the solution, the proper way is to de-
velop over a funnel large enough to receive all the
waste solution that may run off the plate in flow-
ing, allowing it to filter through cotton into a
bottle below, being careful always to drain the
plate under development of all surplus solution
before the development is complete, so that all
the solution will be saved, and being filtered free
from the silver taken up during the development,
falls into the bottle below and is ready for use
again, which may be done by adding two-thirds
of the old solution to one-third of the new. It
will be seen that, in order to use so large a pro-
portion of the old solution, it will be necessary
that at least two-thirds of all that is used should
fall into the filter, but by giving attention to the
directions above a larger proportion can very easily
be saved. By this process we obtain a solution
that will produce the best chemical effects in the
Ferrotype, with the least outlay for materials,
for it will be seen that we are using only one-
third the quantity of new solution that would
otherwise be expended, so that if Ferrotypes are
made for profit, here is a large saving, which is
a pi'ofit, of two-thirds of the ordinary expense
for developing materials.
TWiH solution may also be modified to suit all
degrees of temperature, and all periods of ex*