This will occur if you have to much xylene in your mounting medium, I have 
seen this before and the change to a more purer mounting medium usually 
clears it up.
Thank you
Sharon

>From: "Levac Caron, Joelle" <jlcaron@Ottawahospital.on.ca>
>To: "'histonet@pathology.swmed.edu'" <histonet@pathology.swmed.edu>
>Subject: Leica coverslipper
>Date: Mon, 03 Apr 2000 15:57:16 -0400
>
>Hi
>Has anyone encountered "bubbles" or "voids" on slides after  a 2-week
>storage??  A  Leica CV5000 coverslipper was used to mount slides.
>Which clearing agent and mounting medium are you using??
>Joelle
>

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