Ilford ID-37

Pyro film developer for lantern plates

Part A
Water 125F/52C750ml
Pyro12g
Potassium Metabisulfite4g
Cold water to make1000ml
Part B
Water 125F/52C750ml
Sodium Carbonate (monohydrate*)43.3g
Sodium Sulfite (anhydrous)50g
Potassium Bromide2g
Cold water to make1000ml
Part C
Water 125F/52C750ml
Ammonium Carbonate100g
Ammonium Bromide100g
Cold water to make1000ml
Mixing Instructions: Add chemicals in specified sequence.
Dilution: 1+1+0 through 1+1+1. Increase addition of Part C in fractions to alter tone and increase development time.
Usage: Starting point dev time: 2.5-18 mins.

Notes 

*multiply amount by 0.833 if using Sodium Carbonate in anhydrous form.