Hi Doreen,
There are several vendors that carry a permanent aqueous mounting media,
which preserves the staining well. My experience is with Crystalmount
(Biomeda?). It is expensive, but does not require the use of coverslips,
it dries hard. Hope this helps.
Katri 

Katri Tuomala
Anatomic Pathology
St.Joseph's Hospital
Hamilton, Ontario, Canada