This Uranium toner produces brown to red tones. The maximum effect is produced in about 10 minutes, the tone passing from brown to red during this time. Overtoning causes the black to deteriorate. Print flat and slightly light. A weak sodium carbonate solution will remove color and image. Wash in acidified water.
Working Solution
| Chemical | Amount | Units |
|---|---|---|
| Water | 1000 | ml |
| Uranium Nitrate | 2.5 | g |
| Potassium Oxalate | 2.5 | g |
| Potassium Ferricyanide | 1 | g |
| Ammonium Alum | 6 | g |
| Hydrochloric Acid, 10% | 5 | ml |
REFERENCE
Uranium Toner (Kodak T-9);
Lange's Handbook of Chemistry, p.1681
Uranium Print Toner;
Peter Hughes
(Reichelt), Mastering Black-and-White Photography, p.49.