You can't practically get any colder than liquid nitrogen and if you
don't want ice artefact then I guess you have to use it. The only issue
sometimes is that you can get a bubble of nitrogen around the tissue
that acts as an insulator; maybe you can freeze in/ on metal foil?
What are the problems you have or why is your boss unhappy? If it's ice
crystal artefact you must freeze faster, if it's nuclear staining, try
post fixing the slides before staining in an alcohol.
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