Quote:
Originally Posted by Rob Archer
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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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.