The DARKROOM COOKBOOK, Third Edition

284 THE DARKROOM COOKBOOK
After combining the solutions, continue as follows:
Add water to make 4.0 liters
* The silver nitrate should be dissolved completely before adding the sodium chloride; immediately
afterward, add the solution containing the milky white precipitate to the hypo-alum solution.
The formation of a black precipitate in no way impairs the toning action of the bath if adequate
agitation is used.
Using the Toner: Pour into a tray supported by a water bath heated to 120F/50C. Bring the
toner to this temperature. At this temperature prints will tone in 12 to 15 minutes, depending
on the type of paper. Never use the solution above 120F/50C because blisters and stains may
result. Toning should not be continued longer than 20 minutes at 120F/50C.
Toning may be sped up by placing the prints in a bath of 10% sulfuric acid for 1 minute
and then transferring them directly to the toning bath.
In order to produce good sepia tones the prints should be exposed so that the print is
slightly darker than normal when developed normally (1½ to 2 minutes).
The prints to be toned should be fi xed thoroughly and washed for a few minutes before
being placed in the toning bath. Dry prints should be soaked for 5 minutes in water. To
ensure even toning the prints should be immersed completely and occasionally separated,
especially during the fi rst few minutes.
After the prints are toned they should be wiped with a soft sponge and warm water to
remove any sediment then washed for 1 hour in running water.
NOTE: When the toner is fi rst mixed, it has too great a reducing action. This can be avoided
by toning a few waste prints before the toner is used on good prints.
FORMULA #148
Kodak T-7a
Sulfi de Sepia Toner
For cold-tone papers
STOCK BLEACHING SOLUTION A
Potassium ferricyanide, 75.0 g
Potassium bromide, 75.0 g
Potassium oxalate, 195.0 g
Acetic acid, 40.0 ml
Water, 2.0 liters
STOCK TONING SOLUTION B
*Sodium sulfi de, 45.0 g
Water to make 500.0 ml
* Be sure to use sodium sulfi de, not sodium sulfi te.