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-   -   Sodium Sulphite (http://www.film-and-darkroom-user.org.uk/forum/showthread.php?t=13379)

Martin Aislabie 28th August 2020 02:53 PM

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

Rob Archer 28th August 2020 04:24 PM

If it's still white it should be fine. I've used sodium sulphite that's over a decade old with no problem.

Stocky 28th August 2020 10:17 PM

Quote:

Originally Posted by Rob Archer (Post 135273)
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.

Lostlabours 29th August 2020 07:44 AM

Should be fine, if in doubt use it 1-2% solution as a wash aid for prints.

Ian

Martin Aislabie 30th August 2020 05:28 PM

Thanks guys

Martin


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