Paleonet: problems with some old thin sections

Rasser, Michael michael.rasser at
Mon Sep 10 07:40:04 GMT 2018

Dear Bruno, I have never seen something like this, but are you sure that it
is a problem of aging? Can it be a mistake that happened during glueing the
chip onto the glass?
Greetings, Michael

Priv.-Doz. Dr. Michael W. Rasser, Kurator für Känozoische Invertebraten
Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, D-70191
Stuttgart, Germany
Email: michael.rasser at, Fon: +49-(0)711/8936-146 | Fax:

2018-09-09 18:00 GMT+02:00 Bruno Granier <bgranier at>:

> Dear Paleoneters,
> some time ago, I have inherited a large collection of (petrographic)
> thin sections, mostly from limestones, prepared to study their
> microfossil contents.
> A significant number displays a centripetal deterioration (see
> pictures attached). Apparently it affects the glue. May be you have
> faced a similar problem and I should be very pleased if you could
> share your "bad" experience:
> 1) is there a way to revert the process?
> 2) if not, is there a way to stop it?
> "Bien à vous",
> Bruno Granier
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> Paleonet at
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