Paul & Ross
On your comments...

" Another option is one of the commercially available aerosol refrigerant sprays
(tetrafluoroethane or similar compounds) which are available in small, easy
to use cans, and which can bring a tissue sample down to about -50 degrees C
in a couple of seconds."

Back in the days when automotive Freon was redily avaiable, I used it to
collect chitons and limpets. Quick termination of the subject and no prying.

Never id get the curling thing quite down....

Leslie

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