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Published online by Cambridge University Press: 14 March 2018
All laboratory workers face the ongoing requirement that all chemicals and solutions used in the lab be labeled with the date of receipt or preparation, together with the expiration date of the chemical and the initials of the preparer, as well as any known hazards associated with that chemical. Officials from accrediting agencies, sometimes unannounced, pick and poke around laboratories looking for outdated chemicals and solutions, including biological stains left unsuspectingly at the back of a fridge or on a seldom used shelf.