Re: Slide "Plains"

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There may be a combination of problems.

The fuzzy slides could be caused by the microwave drying.  I've seen fuzzy
appearance when slides have been dried too long and/or the microwave
temperature was too high.

I don't know what coverslipping medium you are using or what vendor you are
allowed to purchase from, but many of the vendors do have excess to
different distributors that are not listed in their catalog.  Could you
e-mail me or call me at 800-222-0342x443 with this info?  I would be more
than happy to send you samples of a different coverslipping medium.

The holes in your blocks could be caused by embedding technique and can
happen when the paraffin that gets poured into the base mold is allowed to
cool to much before placing the tissue into it.


Rande Kline HT (ASCP)
Technical Services
EM Science on 02/25/99 07:20:09 PM

Subject:  Slide "Plains"

Hello Histonetters, I was hoping you could help me a couple problems.My
pathologist was complaining that the stained H & E sections in our daily
was somewhat on different "plains" and needed constant focusing while under
the scope. I sat down with her and went over some slides, these sections
somewhat "fuzzy or hazy" in some places and crisp in other, which makes me
think possibly it's the mounting medium...we've been using this medium for
sometime (resinous) and unfortunately we're on contract so my options are
limited (for purchasing that is). Could it possibly be the deparaffination
process? We microwave our sections to melt the paraffin, and put them in
Xylene for 6 minutes to clear before sending them down the stainer. It does
not happen on all the tissue, and there does not seem to be any preference
to type of specimen either (happens to bx's and surgicals). Any
Also, we seem to be getting holes in our blocks after embedding, the VERY
irritating experience is becoming more and more frequent. We have fresh
paraffin in our dispenser (and processor) and have a cold plate at optimal
temperature, yet it seems at least 4-5 blocks per day are "breaking" when
trimming because of these holes. Is it possible that we may be embedding
fast? Not giving the warm paraffin time to combine with the cold paraffin
after inserting the tissue in the mold? Could it be that we aren't cleaning
the molds enough? Again, any suggestions? Thanks for your help in advance,
I love this net......

Kari Zajic HT,MLT
Lead Histotech

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