Hi Histonetters,

         We do a lot of plastic work as we're a research Histology Lab.  We 
used to use Leica's Historesin with great success.  JB-4 did not pick up 
the stains as well and had a tendency to yellow so Historesin was the resin 
we used.  Due to new shipping regulations, Leica is no longer importing it 
into the USA from Germany as the shipping is too costly.  Technovit 7100 is 
supposed to be virtually identical but we're having problems with it.  It 
sets too quickly and it doesn't seem like the resin infiltrates 
properly.  Our blocks are still a little soft, despite repeated baking and 
there are holes in the tissue.  Is anyone else having problems and have 
they come up with a solution or a better resin?

Lesley



Lesley S. Bechtold
Supervisor, Biological Imaging
The Jackson Laboratory
600 Main St.
Bar Harbor, ME 04609
207-288-6191