A Slide Mounter can be used for several things.
If you've got a diatom test slide from Klaus Kemp you will note a small "finder ring" around the 8 diatoms to help locate them quickly.
In addition, the edge of the round coverslip is sealed to the slide very neatly, again using a ringer.
On coverslips that I ring, I let the dark colored edge sealant dry, then add a thin white ring on top to allow identifying the top of the slide while not wearing glasses.
Another use is making support rings to prevent crushing a specimen when applying the cover slip.
This was my original motivation since I
wanted to make whole mounts of deer ticks without mashing them in the
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