I have been a Prefer user for many years now and have never seen this problem.  Do you buy predilutes or make yours from the concentrate?  If it's the later, could it be the water source?  Either way, I would start by contacting ANA-Tech directly; they are great to work with and I am sure they will help you with this problem.

Mary Bryhan HT (ASCP)
Team Leader - Anatomic Pathology
Northern Michigan Hospital
Petoskey, MI

>>> "P. Emry"  02/13/03 02:36PM >>>
We have just found round growths of white mold on specimens that were
perfused and stored in Prefer fixative.  Some of them are more than an
inch in diameter.
Has anyone else had this problem?
How can it be treated and how can it be prevented?

Should we be expecting this from something called a "fixative".

Thanks,

Trisha