Uranium is a truly startling and dramatic toner that reliably produces a wide range of rusty-orange tones on almost any paper. Print flat and slightly light. Beware of overtoning as this causes the black to deteriorate. As with iron, a weak sodium carbonate solution will remove color and image. Wash in acidified water.
Working Solution
| Chemical | Amount | Units |
|---|---|---|
| Water | 1000 | ml |
| Uranium Nitrate | 8 | g |
| Oxalic Acid | 4 | g |
| Potassium Ferricyanide | 4 | g |
REFERENCE
Uranium Print Toner;
Peter Hughes
(Reichelt), Mastering Black-and-White Photography, p.49.