[pure-silver] Re: Sodium bisulfite
- From: "John Black" <jblack@xxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 16 Mar 2005 12:16:33 -0500
> I think that reaction is slow at room temperature and at regular
> developer pH range, say above 7. I think more problem with storage of
> sulfite solution alone is the pathway that involves sulfur trioxide
> anion radical and maybe hydroxyl radical.
> --
From a purely observational viewpoint, I have noticed that the recrystalized
sulfite in the bottom of my saturated bottle most closely resembles hydrated
sodium sulfite in it's dry form (i.e large clear crystals). Also, I have
noticed that when left undisturbed for several days, the solution in the vi
citing of the crystals becomes more dense, that is when stirred it
momentarily exhibits visible convection swirls. I presume this may be due
to temperature fluctuations between night and day causing a slight gradient
within the bottle.
Anyway, the sulfite, as measured densitometrically using fresh solution as
control, seems to hold up well at saturation. No rank, sulfurous smells
from the headspace either.
JB
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