With this toner it is possible to obtain a variety of pleasing brown tones by varying the time of toning. Prints may be removed from teh bath when the desired color is reached. This formula is suitable for use with Cykora, Indiatone, Cykon and Convira.
|Hot Water (125F or 52C)||4 L|
|Sodium Thiosulfate||960 g|
|Ammonium Persulfate||120 g|
Dissolve the hypo completely before adding the persulfate. Stir vigorously while adding the persulfate. If the bath does not turn milky, increase teh temperature until it does.
Prepare following solution and add it (including precipitate) slowly to the hypo-persulfate solution while stirring the latter rapidly. Bath must be cool when these solutions are added together.
|Cold water||64 ml|
|Silver Nitrate||5.2 g|
|Sodium Chloride||5.2 g|
NOTE: The silver nitrate should be dissolved completely before adding sodium chloride.
|Gold Chloride||1 g|
For use, add 4 ounces (125 ml) of Solution 2 slowly to Solution 1 while stirring the latter rapidly. The bath should not be used until after it has become cold and has formed a sediment. Then pour off the clear liquid for use.
Pour the clear solution into a tray standing in a water bath and heat to 110F (43C). The temperature, when toning, should be between 100 and 110F (38 to 43C). Dry prints should be soaked throughly in water before toning.
Keep at hand an untoned black and white print for comparison during toning. Prints should be separated at all times to insure even toning.
When the desired tone is obtained, rinse the prints in cold water.
After all prints have been toned, return them to the fixing bath for five minutes, then wash for one hour in running water.
The bath should be revived by the addition of further quantities of the gold Solution 2. The quantity to be added will depend upon the number of prints toned and the time of toning. For example, when toning to a warm brown, add 1 dram (4 ml) of solution after each fifty 8×10 prints, or their equivalent, have been toned. Fresh solution may be added from time to time to keep the bath up to the proper volume.
From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference. They may not work well with modern films and papers. Some of the chemicals can be dangerous. As with all photographic processes, be careful.