Achrived tissue viability when stored in 10% formalin


The company I work for has been asked by one of our clients how long tissue (animal) can be stored in formalin and still be viable.  We have gone back to tissue stored for ~10yrs. but the staining was poor.  If there is any advice on where we can find documentation of this information it would be appreciated. Any thoughts on the time frame also are welcome.

Thank You,

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