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Old 28th August 2020, 02:53 PM
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Martin Aislabie Martin Aislabie is offline
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Default Sodium Sulphite

Does sodium sulphite go off over time?

Ferreting around at the back of my darkroom cupboards, I have found an old container 3/4 full of sodium sulphite.

It is probably 10+ years old.

Will it still work or does it need to be shown the bin ?

Martin
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Old 28th August 2020, 04:24 PM
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If it's still white it should be fine. I've used sodium sulphite that's over a decade old with no problem.
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Old 28th August 2020, 10:17 PM
Stocky Stocky is offline
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Quote:
Originally Posted by Rob Archer View Post
If it's still white it should be fine. I've used sodium sulphite that's over a decade old with no problem.
It's probably ok. Even if it's a few percent oxidized, usually the quantities of it in photographic solutions are large enough to accommodate some variation (e.g. often 50 to 100g/L).

I doubt that its colour can be use as an indication though.
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Old 29th August 2020, 07:44 AM
Lostlabours Lostlabours is offline
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Should be fine, if in doubt use it 1-2% solution as a wash aid for prints.

Ian
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Old 30th August 2020, 05:28 PM
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Thanks guys

Martin
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