The DARKROOM COOKBOOK, Third Edition

Formulas 277
Add 16 drops of concentrated sulfuric acid slowly with constant stirring to the cold A � B.
Use the bath at 75F/24C. Prints should be toned two at a time, back-to-back and well
covered with the toning solution. Agitate occasionally. Toning will take from 5 to 20 minutes.
The bath may be used until exhausted. The stock solutions will keep indefi nitely, but
the mixed toner will not keep for more than a few days. The toned print is permanent and
will not fade or change color.
If a lighter shade of blue is desired, remove the prints from the toning bath before the
maximum effect is reached. After toning, treat the prints in a washing aid and wash for
½ hour; dry as usual.
Prints to be blue-toned should be developed in Dassonville D-3 Autotoning Developer.
(Other warm-toned developers can be used, but they will probably not give as deep a blue
tone. A warm-toned print will give a deeper blue than a cool-toned print; D-3 will give very
warm-toned results and correspondingly deep blues.)
Prints should be slightly softer and lighter than normal and should be developed for
5 minutes. This long development is important. If the print is too dark, decrease exposure; do
not reduce development time.
After development, the prints should be fi xed in a non-hardening fi xer and thoroughly
washed. Two-bath fi xing is recommended, the second being a plain hypo bath without hardener.
NOTE 1: Stains are caused by incomplete washing between fi xing and toning.
NOTE 2: The surface of the print will be quite soft after washing since no hardener is used
in the fi xing bath. It is recommended that the prints be dried between washing and toning.
This will tend to harden the emulsion slightly and help to prevent frilling in later baths (frilling
separates the emulsion from the paper; this also can occur when solutions or wash water
are excessively hot). Care should also be used in handling the prints after toning.
NOTE 3: The stock solutions will keep indefi nitely, but the mixed toner will not keep for
more than a few days.
FORMULA #139
Gold Chloride Blue Toner
This gives a soft, grayish purple rather than a vivid blue. A green-blue tone will appear on
some chlorobromide papers.
SOLUTION A
Water, 250.0 ml
*Thiocarbamide, 3.5 g
*If thiocyanate is substituted for thiocarbamide more purplish tones will appear.
SOLUTION B
Water, 250.0 ml
Citric acid, 3.5 g