question on expiration date for archive tissue in formalin

From:"Raiford, Betty"

A question has come up about expiration date for formalin in containers
where tissue is stored in archives for long periods of time.  We are
research facility and keep residual tissues from study animals for 8 - 10
years after study completion.  Should there be expiration dates on the
container (whether it is bags or plastic containers) to indicate the
expiration of the 10% NBF.

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