We use the expiration date on the formalin as the use by date. By the time the solution would be out of date, the tissues should be very well fixed, so the formalin becomes just a holding solution.
Joe Saby NAMSA ________________________________ From: "amitapan...@torrentpharma.com" <amitapan...@torrentpharma.com> To: histonet@lists.utsouthwestern.edu Sent: Wed, May 18, 2011 12:29:58 AM Subject: [Histonet] Expiry date of NBF Dear Histonetters, I require one clarification on declaration of expiry date of 4% nutral buffer formalin (NBF) prepared in our lab ( from 40% solution) ? Do you declare the expiry date of this prepared solution ? If so what criteria do you follow for this? Important to mention that we have to archive these tissue in NBF for 5 years as part of GLP toxicology. Your experience or view on these points are welcomed. Amita _______________________________________________ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet _______________________________________________ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet