do campden tablets go off?

[gr_baker]

I've been rooting around in my brewing supply box and I've found some Campden tablets from 2012 and others from 2008. Is there any chance they'll still be any good for taking chlorine out of brewing liquor?

I realise that I'm being cheap and some new ones aren't expensive.

R

[sonicated]

They do degrade over time, I would get some more.

[Carnot]

If they have been kept in an airtight container and are not crumbling then they should be alright. They are sodium metabisulphite which will only react slowly with air in a humid environment. Even if they are a bit rough around the edges they will probably be alright. They are normally bound with a microcrystalline cellulose which will slowly degrade, usually faster than the metabisulphite.

[wezzel01]

All my acids, salts and chemicals are miles past their sell by date. Some come in such large quantities compared to the tiny doses I use that I would be throwing away almost full containers if I stuck to use-by dates.

Never noticed a problem though. Either I’ve got crap taste buds or I’m just lucky.


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