le
quantity of water, the latter being barely tinged, not of a strong yellow
color. If the print is too dense throughout, it can be immersed without
previous washing in this solution. Reduction should take place gradually,
and this is best accomplished with a weak reducer. If the tray be rocked
gently the reduction will be quite uniform. If, however, only a portion of
the print needs reduction, this can be effected by applying the
ferricyanide solution locally with a brush or bit of absorbent cotton.
Extreme care is needed in this operation. In this way unduly deep shadows
can be softened, veiled high lights brightened, or almost any modification
obtained which may be deemed desirable. When reduction is almost completed
quickly rinse the print in running water and then wash thoroughly. If the
print has been dried, it is only necessary to soak it for a few moments in
a fresh fixing bath, when the ferricyanide can be applied as before.

Latterly the toning of bromide prints has become popular. There are many
methods and innumerable formulae. Here we shall concern ourselves with the
sulphide method which best fulfills the three chief requirements, namely:
(1) Certainty of results; (2) the use of few baths; (3) the production of
permanent prints. Processes which, as regards color, vigor, etc., are
beyond the control of the worker, are of very little practical use.
Equally so, if the toning involves a whole string of operations, the final
outcome of which is usually--a spoilt print. And, lastly, a process
which--however satisfactory it may be in other respects--impairs the
undoubted permanency of a black-developed print is not one worthy of
adoption. In one or two other respects, processes vary chiefly as regards
the depth or intensity which the print must have in order to produce the
most satisfactory result when toned. Thus, prints to be toned with uranium
require to be distinctly on the pale side, whilst those for sulphide
toning are best a little vigorous. One or two other methods, on the other
hand, require the use of the costly gold or platinum salts. The latter,
except under exceptional circumstances, are far better employed in the
legitimate form of platinotype or other platinum paper; bromide prints
toned with platinum will probably cost more, and will never have the
absolute permanence peculiar to the platinum print.

Placed in rough order of merit, the processes available are: Sulphide
toning (hypo-alum toning is