|Silver Nitrate||1.3 g|
|Potassium Iodide||2.7 g|
Add Solution 2 to Solution 1. Then add Solution 3 to the mixture. Finally add 105 grams (3 1/2 oz.) of Potassium Alum to this solution and heat the entire bath to the boiling point or until sulfurization takes place (indicated by a milky appearance of the solution). Tone prints 20 to 60 minutes in this bath at 110-125 F (43-52C). Agitate prints occasionally until toning is complete. Care should be taken to see that the blacks are fully converted before removing the prints from the toning bath, unless double tones are desired.
From Ansco Formulas for Black and White Film by GAF, 1948 Formulas are provided for historical reference.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.