> Hello all,
>
> This query may not be appropriate to the group, but as it does not deal
> with conventonal film development,perhaps it is.
>
> Does anyone have any information on Dr Odell's method of physical
> development for fine grain?
Alex,
I do not know if this is a match for Odell's method, but here goes:
Fore bath
water
750 mls.
sodium sulfite
25 grams
potassium iodide
10 grams
water to make
1 liter
Developer A
sodium sulfite (anhy)
50 grams
silver nitrate
32 grams
sodium thiosulfite (penta) 150
grams
distilled water to make
1 liter
notes on mixing A-dissolve the silver nitrate in 200 mls. of water.
Dissolve the sodium sulfite in 500 mls. of water. Slowly add this to the
silver nitrate solution. When the precipitate that forms has redissolved,
add the sodium thiosulfate. Add water to make up the final volume of 1
liter.
Developer B
water (distilled)
50 mls.
metol
2 grams
sodium sulfite (anhy)
10 grams
hydroquinone
3.4 grams
sodium hydroxide
3.4 grams
distilled water
100 mls.
For use-immerse film in forebath for two minutes. Rinse well. Immerse in
developer made up by combining 10 part A, 1 part B, and 40 parts water.
Make up developer immediately before use, and discard afterwards. Develop
film for 20-30 minutes @ 65F.
Fix in non hardening rapid fix for 15-30 minutes. This takes some time to
complete since the silver iodide dissolves rather slowly. Wash film for
upward of an hour. If film apears milky due to an excess deposit of silver,
it can be cleared by immersing in a 0.1% solution of potassium dichromate
containing 0.2 % sulfuric acid (can be substituted with sodium
bisulfate-3.8 grams for each ml. of sulfuric acid) . If the film is
underdeveloped, it can be redeveloped again after fixation in a fresh
developer bath-at this point it becomes a silver intensifier.
Maxim M. Muir
See the "Maximum Monochrome" homepage at:
<http://www.nfinity.com/~mdmuir/>