From:Barry Rittman

I think that it is a good idea to make sure that you do not have any
bubbles in the mounting media that you are using as some are susceptible
to this. Can easily remove bubbles using an ultrasonic bath for a minute
or so when all the bubbles will rise to the surface. Used to do this
after mixing epoxy resins for EM.
This also works for the support media for frozen specimens as some
bottles tend to accumulate small bubbles.

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