Ewesly / Holographic Formulae / Nick's No. 6
Nick's Number 6
10 g Pyrogallol
10 g Potassium Bromide
One litre water
20 g Sodium Metaborate
120 g Sodium Carbonate
One liter water
Temperature: 23C +- 1C Agitation: Constant
Part A probably a few days to a week, Part B indefinitely.
Primary recommendation for Ilford green-sensitive materials for same wavelength replay in the reflection mode when followed by a rehalogenating bleach. SP737T will work in this brew but at a stop loss in speed. A properly exposed plate will sit in this brew for a half a minute before any darkening appears.
Tray life of the combined solutions is about 15 minutes, Part A will last two or three days in a full stoppered bottle, but Part B will last indefinitely.