Re: Expiration Date

Hi Salvacion,

There are two articles I wrote concerning expiration dating in the EM Science
website under Tech Corner/ FAQ/Expiration dating.  I think you will find them
helpful for the chemical part of your question.

As far as dyes are concerned, I'm sure some will say they get better with age
and they really do.  I've used some dyes that I know had to be 15 years old and
they worked fine.  I would not say that for all though.  Dyes like giemsa or
wright stain will start to oxidize over time.

Rande Kline, HT (ASCP)
EM Science

"DeLovino, Salvacion S."  on 03/20/2002 02:34:09 PM

cc:    (bcc: Rande Kline/EMI/Merck)
Subject:  Expiration Date

     Hello Histonetters:

     What's the usual shelf life of most chemicals and dyes when the
expiration dates are not indicated on the container? We have a whole lot of
old chemicals and dyes that we don't know if they're still good or not. Some
date back to the 60's! Thanks in advance.

     Salvacion S. Delovino

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