Speed-increasing film developer

Water 125F/52C750ml
2(beta-hydroxyethyl) aminophenol sulphate6g
Sodium Sulfite (anhydrous)100g
Sodium Carbonate (anhydrous)11.5g
Sodium Hexametaphosphate1.7g
Cold water to make1000ml
Mixing Instructions: Add chemicals in specified sequence.
Dilution: 1+9 or 1+14


Promicrol is considered by many to be one of the best speed-increasing developers ever made. Sadly one of its key ingredients 2(beta-hydroxyethyl) aminophenol sulphate (aka HEAP sulfate) is no longer in production anywhere in the world. Current commercial products sold under the name Promicrol or claiming to be similar to Promicrol are not comparable to this formula.
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