DEVELOPERS 113 
B. Caustic potash 1l.5¢ 88.3 gr. 
(or Caustic soda) 8.5 g 65.3 gr. 
Water 1000 ccm 16 oz. 
For use mix | part A, 1 part B and 1 part water. 
Pyro-Acetone (Lumiere) — 
A. Pyrogallol 100 g 768 gr. 
Sodium sulphite, dry 200 g 1536 gr. 
Water 1000 ccm 16 oz. 
Potassium metabisulphite must not be used, nor must acid be 
added. For use mix A 8 parts, acetone 8 parts and water 
100 parts. 
Pyro-Potash (Beach) — 
A. Pyrogallol 100 g 1 oz. 
Sodium sulphite, dry 200 g Zoz: 
Sulphurous acid 400 ccm 4 oz. 
Hot water 500 ccm Doz 
Dissolve the sulphite; when cold add the acid, and then the 
pyro. 
B. Potassium carbonate Joo) 8 HE oVOZ 
Sodium sulphite, dry lilg 1 oz. 
Hot water 1000 ccm 10 oz. 
For use mix 1 part A, 2 parts B and 16 parts water. 
Cramer's Pyro Tank Developer.— 
Sodium bisulphite 19.5¢ 2Y4 02. 
Sodium sulphite, dry 19iSie 24 02. 
Hot water 500 ccm 64 oz. 
Dissolve and boil for 5 minutes; then add: 
Pyrogallol 15.512 2 02. 
Sodium carbonate, dry 27 3Y oz. 
Cold water 500 ccm 64 oz. 
To keep up to original strength and bulk, add equal volumes 
of the following (A and B) after each day’s working: 
