You will like Pen Fix alot. You do not have to Formalin fix first.
But there is a limited time it should be in Pen Fix, I think 36 to 48
hours, but check with the insert.

carolyn.luty@muhc.mcgill.ca wrote:
>
> I have just ordered Penfix for a trial. Do I have to put the tissue in
>formalin
> before ? How long do I leave the tissue in Penfix?
>
>       Thanks
> Carolyn Luty
> Montreal General hospital