Gevaert G.107

High contrast film developer for extreme contrast on process films

Part A
Water 125F/52C500ml
Sodium Bisulfite25g
Hydroquinone25g
Sodium Bromide25g
Cold water to make1000ml
Part B
Cold Water500ml
Sodium Hydroxide50g
Cold water to make1000ml
Mixing Instructions: Add chemicals in specified sequence. Always use cold water when mixing potassium or sodium hydroxide due to risk of heat reaction.
Dilution: Mix equal parts. Use undiluted.
Usage: Starting point dev time: 4 mins.

Notes 

Separate solutions will last well in storage, but once A+B are mixed the working solution must be used within one hour.