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|
| Part A | ||
| Potassium Ferricyanide | 40 | g |
| Water | 1000 | ml |
| Ammonia 25% | 15 | ml |
| Part B | ||
| Ferric Ammonium Citrate | 17 | g |
| Water | 1000 | g |
| Hydrochloric Acid (concentrated) | 40 | ml |
| Part C | ||
| Sodium Sulfide | 2 | g |
| Water | 1000 | ml |
| Hydrochloric Acid (concentrated) | 10 | ml |
| Mixing Instructions: Add chemicals in specified sequence. Always add Hydrochloric Acid to the water, never add water to acid. Do not add Hydrochloric Acid to Solution C until immediately before use. Prepare all solutions within 24 hours of use. |
| Dilution: Use undiluted. |
| Usage: Prints should be darker and softer than normal, approximately 25% overexposed and on one grade softer, fully fixed, thoroughly washed and dried. Soak print in cold water until limp, then place in Solution A until bleached (typically about 60 secs or less). Transfer immediately to running water and wash for at least 30 mins. Place bleached print in Solution B for 45-60 secs until deepest shadows are toned. Wash print briefly (about 4-6 mins). Avoid overwashing or alkaline water as either will weaken the blue tone. Acidify wash water with small amount of acetic acid if required. Immerse blue-toned prints in Solution C until green tone is sufficiently strong (typically about 30 secs). Wash 20-30 mins in neutral or acidied water. Dry without heat. |
Notes Due to risk by inhalation, Solution C must be mixed and used in a well-ventilated space, preferably next to an open window or exhaust fan.WARNING: Hydrochloric Acid is hazardous. Wear gloves at all time to avoid skin contact. Ensure respiratory safety when handling. |
