[pure-silver] Re: sodium sulfite and air
- From: Dennis Purdy <dlp4777@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 17 Feb 2010 11:10:05 -0800
On Feb 17, 2010, at 10:49, Nicholas O. Lindan wrote:
Sulfite goes off with exposure to oxygen and changes to
sulfate. Sulfate is a salt with no photographic activity.
Metol is also oxidized by exposure to air. Patrick
Gainer provides information on the oxidation of Metol in the
presence of sulfite:
http://photo.net/black-and-white-photo-film-processing-forum/00SfQH
If there is no compelling reason for storing metol & sulfite
(AKA D-23) in an open beaker then it would be a good idea not
to.
Nicholas O. Lindan
Cleveland Engineering Design, LLC
Cleveland, Ohio 44121
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thanks Nicholas. the compelling reason for my leaving a gallon out
all night is my own forgetfulness due most likely to old age.
However I went ahead and continued my processing were I left off
yesterday and it seems to be working fine. I can't see a difference
from earlier film batches.
Dennis
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