Green Toner

Green toner

Part A
Potassium Ferricyanide40g
Ammonia 25%15ml
Part B
Ferric Ammonium Citrate17g
Hydrochloric Acid (concentrated)40ml
Part C
Sodium Sulfide2g
Hydrochloric Acid (concentrated)10ml
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.


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.
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