Natural oils after expire date

Dec 30, 2011 23:26

I have a big collection of really expensive natural oil essences, but they are old already. Most of them expired in 2005.
I wonder can the smell of them harm after the expiration date?
Does anyone know what happens with oil after the expiration date, why they have this date at all,
I cannot tell that something is wrong by the smell of them now.

questions

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