have you tried boiling it with baking soda? was the film acros?
If you want to learn more read Fieser and Fieser.
PE
In a test I found the developing agent from glucose to be notably less active than is sodium ascorbate in Xtol.
Details- Glucose 2tbs, Sodium carbonate decahydrate 3tbs,water to 600ml, heat at boiling 10 min, cool.Add ~1.2 tbs baking soda.
Store in sealed container. 2 days later add sodium sulfite and phenidone equivalent to 80g/L and 0.2g/L, pH=9.0 +/- 0.1.
Development time for old APX 400 ~32min 20C, 4 times that in Xtol 1+0 (8 min).
The new test had much more Xtol-like conditions than that in post 405 but it was done with well out of date film and with a 2 day delay after boiling.
I will try again with these possbile error sources avoided.
The amount and purity is unpredictable, and it contains Sodium Silicate. The latter can become embedded in film if not fully dissolved.
PE
Solvent action?
If the active development agent in whatever developer you are about to brew is some dihydroxy-benzene, then sulfite may act as scavenger for oxidized developer, and thereby make development more even (c.f. Hydroquinone based developers with or without sulfite).
While e.g. oxidized Catechol or Pyrogallol form brown insoluble compounds at low sulfite levels (c.f. staining developers), this may not work as well with these substituted Catechols, so sulfite may be good for these, too.
If the most active development agent in your pineapple juice is Ascorbic Acid, then sulfite won't scavenge oxidized Ascorbate, but it will still do all these things which PhotoEngineer brought up.
PS: One more thing that I would like to bring up: both, dihydroxy benzenes and Ascorbic Acid will need moderately high pH of about 10 in order to develop film, and none of these developers will be remotely edible. Since coffee appears to contain a compound which accelerates development by ascorbate, it might be possible to use Sodium Bicarbonate instead of Sodium Carbonate as alkali, plus one could leave out the sulfite. This could potentially create a developer, which would actually be edible, although not necessarily tasty.
Since Sodium Sulfite does several things at once, there are different levels of Sodium Sulfite which are useful for different reasons:not sure how much sodium sulfite I'm going to add....
Since Sodium Sulfite does several things at once, there are different levels of Sodium Sulfite which are useful for different reasons:
- 1-5 g/l: prevent immediate oxidation of development agent
- 10-30 g/l: scavenge oxidized developer, prevent staining. Also, very mild solvent effect which boosts film speed compared to dev without sulfite.
- 30-125 g/l: add solvent effect which softens grain.
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