Ewesly / Holographic Formulae / JD-1, Pyrochrome
Contents
Stock Solutions
PART A
10 g Pyrogallol
One litre water
PART B
60 g Sodium Carbonate
One litre water
Mix equal parts together immediately before use.
Developing times
Reflection holograms: One minute for film, two minutes for plates.
Transmission holograms: Two to four minutes for films or plates.
Temperature: 20C Agitation: Constant
The original recipe for the tanning developer - solvent bleach processing regime, giving low noise transmission holograms or wavelength shifted reflection holograms with a characteristic brown stain on the emulsion.
Primary recommendation
for high speed holographic materials like Kodak SO-253/Type 131 or Agfa's 10E75 or 10E56, and also usable for Agfa 8E materials. Recommended bleach is the silver solvent type like 'Chrome bleach, not diffusion-rehalogenation. Colour Holographics recommends this developer for their BB series of plates.
Shelf life
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.