[Nhcoll-l] old glass containers

Sat Mar 21 07:19:40 EDT 2015

... brushing with a brass brush works very well, too; this method has 
the advantage that you bring the very thin silicone film off that 
normally remains on the glass surface (e.g. if you use razor blades to 
scratch the silicone off - old aquarium hobbyist trick ;-)

A bit tiresome so, but good results (may stain the glass surface a bit 
golden, but this rather just looks fancy without causing trouble). For 
closing again, use a high quality vacuum grease (be sure to exclude any 
silicone based vacuum greases).

Am 21.03.2015 um 00:46 schrieb John E Simmons:
> Paul is right, don't try to pry the lid off silicon. Once the lid has 
> been removed, you can scrape the silicon off with a blade, then use a 
> silicon release agent (which you can buy at a hardware store) to get 
> the remaining silicon off of the glass before you apply a new gasket.
>
> John E. Simmons
> Museologica
> 128 E. Burnside Street
> Bellefonte, Pennsylvania 16823-2010
> simmons.johne at gmail.com <mailto:simmons.johne at gmail.com>
> 303-681-5708
> www.museologica.com 
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> and
> Adjunct Curator of Collections
> Earth and Mineral Science Museum & Art Gallery
> Penn State University
> University Park, Pennsylvania
> and
> Instructor, Museum Studies
> School of Library and Information Science
> Kent State University
> and
> Lecturer in Art
> Juniata College
> Huntingdon, Pennsylvania
>
> On Fri, Mar 20, 2015 at 6:36 PM, Callomon,Paul <prc44 at drexel.edu 
> <mailto:prc44 at drexel.edu>> wrote:
>
>     It looks as though your lids have been glued on with clear
>     silicone caulk. This can stick to old glass like crazy and makes
>     getting the lid off tricky. Rather than trying to dissolve it or
>     pull the lid off, my recommendation would be to cut through the
>     silicone all round with a fine model-makers's saw or an X-acto
>     knife with a long blade.
>     ------------------------------------------------------------------------
>     *From:* nhcoll-l-bounces at mailman.yale.edu
>     <mailto:nhcoll-l-bounces at mailman.yale.edu>
>     [nhcoll-l-bounces at mailman.yale.edu
>     <mailto:nhcoll-l-bounces at mailman.yale.edu>] on behalf of Nancy
>     Glover McCartney [nmccartn at uark.edu <mailto:nmccartn at uark.edu>]
>     *Sent:* Friday, March 20, 2015 2:54 PM
>     *To:* nhcoll-l at mailman.yale.edu <mailto:nhcoll-l at mailman.yale.edu>
>     *Subject:* [Nhcoll-l] old glass containers
>
>     I have several old glass containers housing fish, herps, inverts,
>     etc. that are getting very low on fluid. I expect the containers
>     are pretty brittle, as a gar with a giant lobster broke with
>     almost no provocation and spewed formalin all over: not a process
>     I want to repeat.  I don't have any idea what these specimens are
>     stored in.
>     I have attached a few pix of fish and the screw down tops that
>     appear to have parafilm  or an ancient rubber around the lid; some
>     of the smaller containers have what may be beeswax holding in a
>     stopper.
>     Should I attempt to open and replace fluid?  If so, how? What
>     precautions?
>     An earlier query 10 years or so ago said just to leave them alone,
>     but maybe there is different advice now.
>     I'd appreciate some doable suggestion.
>     My thanks in advance, as always.
>     Nancy Glover McCartney, PhD
>     Curator of Zoology
>     UA Collections Facility
>     120 BIOMASS
>     University of Arkansas
>     2435 Hatch
>     Fayetteville AR 72701
>
>     Phone: 479-575-4370 <tel:479-575-4370>
>     Fax: 479-575-7464 <tel:479-575-7464>
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Dirk Neumann

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