The DARKROOM COOKBOOK, Third Edition

288 THE DARKROOM COOKBOOK
The mixed solution will not keep well and should be discarded after use. Prints that
appear weak after toning can be strengthened by immersing in a bath composed of the
following:
Copper sulfate, 48.0 g
Potassium bromide, 24.0 g
Acetic acid, 28% solution, 50.0 ml
Water to make 1.0 liter
Prints should be washed another ½ hour after using this solution. Fresh solution should
always be used.
FORMULA #152
GT-15
Copper Red Toner
SOLUTION A
Potassium citrate, neutral, 100.0 g
Water at 68F/20C, 500.0 ml
SOLUTION B
Copper sulfate, 7.5 g
Water to make, 250.0 ml
SOLUTION C
Potassium ferricyanide, 6.5 g
Water to make 250.0 ml
Mix Solution B with Solution A. While stirring, slowly add stock Solution C.
NOTE: GT-15 bleaches the print. Compensate by extending the printing time as much
as 50%.
Dye Toners
FORMULA #153
Single-Solution Dye Toner
Wood (methyl) alcohol, 100.0 ml
Potassium ferricyanide, 1.0 g