Kodak Gold Toner T-21 Formula
The Kodak Gold Toner T-21 has the advantage that a variety of excellent brown tones may be obtained by varying the time of toning; that is, the prints may be removed from the bath at any time when the desired color is reached.
|Stock Solution A|
|U. S. Liquid||Metric|
|Warm water, about 125F (50C)||1 gallon||4.0 liters|
|Kodak Sodium Thlosulfate (Hypo)||2 pounds||960.0 grams|
|Kodak Potassium Persulfate||4 ounces||120.0 grams|
Dissolve the hypo completely before adding the potassium persulfate. Stir the bath vigorously while adding the potassium persulfate. If the bath does not turn milky, increase the temperature until it does.
Prepare the following solution and add it (including precipitate) slowly to the hypo-persulfate solution while stirring the latter rapidly. The bath must be cool when these solutions are added together.
|Cold water||2 ounces||64.0 cc|
|Kodak Silver Nitrate, crystals||75 grains||5.0 grams|
|Sodium Chloride||75 grains||5.0 grams|
|Note: The silver nitrate should be dissolved completely before adding the sodium chloride.|
|Stock Solution B|
|Water||8 ounces||250.0 cc|
|Kodak Gold Chloride||15 grains||1.0 gram|
For use, add 4 ounces (125 cc) of Solution B slowly to Solution A 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 supported in a water bath and heat to 110F (43C). During toning the temperature should be between 100 and 110F (38 and 43C).
Prints to be toned should be washed for a few minutes after fixing before they are placed in the toning solution. Dry prints should be soaked thoroughly 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 (5 to 20 minutes), remove and rinse the prints in cold water. After all prints have been toned, return them to the fixing bath for 5 minutes, then wash for 1 hour in running water. The bath should be revived at intervals by the addition of Gold Solution B. 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 cc) of gold solution after each fifty 8 x 10 inch 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.
Prints toned in Kodak Gold Toner T-21 should be kept from excessive amounts of heat or intense light.