Time of Toning—Four to five minutes.
Time of Washing—Ten to fifteen minutes.
Life of Baths
The toning baths A and B are comparatively stable and will keep until exhausted.
Tone G
Tone G—Olive Green (Iron)
Positive Employed—Thin to medium.
The best tones are only obtainable on film developed in an Elon-Hydrochinon developer. Thoroughly bleach the well washed film in:
| Avoirdupois | Metric | |||
| A. | Potassium Ferricyanide | 20 lbs. 12 ozs. | 10,000 | grams |
| Ammonia (concentrated .89) | ½ gal. | 2 | liters | |
| Water to | 50 gals. | 200 | liters | |
Time of Bleaching—Two to five minutes.