[Histonet] Expiration Dates on Reagents

Jennifer MacDonald JMacDonald <@t> mtsac.edu
Wed Apr 18 19:56:36 CDT 2007

When we have received dry chemicals without the expiration date, I called 
the company to ask.  Hydroquinone is an example.  The bottle was received 
new with no expiration date.  I called the company and was told that once 
it was opened it was only stable for 1 year.  Once reagents have been 
diluted the expiration date is shortened.  The more dilute the reagent the 
shorter the expiration date for that reagent.  Frieda Carson's book has a 
chart for expiration dates for prepared reagents, as does the staining 
manual of Charles Churukian.

Jennifer MacDonald
Director, Histotechnician Training Program
Mt. San Antonio College
1100 N. Grand Ave.
Walnut, CA 91789
(909) 594-5611 ext. 4884
jmacdonald <@t> mtsac.edu

"Norton, Sally" <sally.norton <@t> seattlechildrens.org> 
Sent by: histonet-bounces <@t> lists.utsouthwestern.edu
04/18/2007 11:06 AM

histonet <@t> lists.utsouthwestern.edu

[Histonet] Expiration Dates on Reagents


            Hello all,


            Does anyone know of a list expiration dates for dry
chemicals and reagents for histology?


            Thank you,


            Sally Norton


            Children's Hospital and Regional Medical Center



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