We routinely use paraformaldehyde (2% or 4% PF, prepared in PBS) for
immunocytochemical work. We preferably use it on the same day as prepared
but sometimes use it for up to 3 days stored at 4°C.  Someone told me that
4% stocks can be stored frozen for longer periods of time. Does anyone have
any information on/ experience with frozen PF stocks?

Thank you for sharing your expertise.

Janice Dominov


Janice A. Dominov, Ph.D.
Neuromuscular Research Laboratory	Phone:(617) 726-4458
Massachusetts General Hospital		Fax:  (617) 726-8543
149 13th Street				Email:dominov@helix.mgh.harvard.edu
Charlestown, MA 02129