I believe that elements in the tin start to react when exposed to air *Moggybaby desperately tries to remember her chemistry lessons....* and this can taint / affect the food inside.

I would not store in the tin for more than 24hrs myself but don't worry too much for less than that.

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Thanks everyone. They've had 3 meals with Smilla mixed in and have used about half a can so they won't be in the fridge for more than 24 hours - probably not even 12 when they are eating only Smilla. I've got some of the lids but for bigger cans so need to get some smaller ones.

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Me too, i empty the remainder of the food into a sealed plastic container and put in fridge for no longer than 24 hrs

Kelly x

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Very proud Mummy of Ella my Gorgeous 5yr old daugher
and my beloved fur babies :
Honey born 23/08/10 &
Indy born 08/01/11