[Nhcoll-l] Translucent residue

Tue Mar 11 05:29:39 EDT 2014

... any form of formaldehyde induced precipitation should be restricted 
to the fluid, e.g. paraformaldehyde needles, cloudiness due to formalin 
induced reactions etc. These precipitation should be reversal, i.e. it 
should be able to remove these when washing the specimen jars under hot 
water with normal dish washing detergent. In case of salt incrustations 
this may take some time.

However, if this not a removable coating (at least in parts), you are 
dealing with glass corrosion, which can be triggered by various causes 
(normally promoted in ion-rich environments by a low pH level of the 
fluid - which can also be specimen induced, e.g. leaching formic acids 
from ants, wasps or other acid containing specimens).

All the best
Dirk

Am 11.03.2014 10:12, schrieb Tom Schioette:
>
> I doubt that what Mandy talks of is glass degradation, or at least if 
> it is, then it is probably formalin-induced somehow. I see precisely 
> the same thing which Mandy describes, and, like in her case, in 
> glasses that have contained formalin, probably also with a component 
> of seawater, although I never thought about the latter detail myself.
>
> Tom
>
> Tom Schiøtte
>
> Natural History Museum of Denmark (Zoology)
>
> Universitetsparken 15
>
> DK-2100 Copenhagen OE
>
> Denmark
>
> TSchioette at snm.ku.dk
>
> *Fra:*nhcoll-l-bounces at mailman.yale.edu 
> [mailto:nhcoll-l-bounces at mailman.yale.edu] *På vegne af 
> *Evelyn.Ayre at pch.gc.ca
> *Sendt:* 10. marts 2014 13:30
> *Til:* Mandy Reid
> *Cc:* Anders Hallan; 'nhcoll-l at mailman.yale.edu'; 
> nhcoll-l-bounces at mailman.yale.edu
> *Emne:* Re: [Nhcoll-l] Translucent residue
>
> Hi Mandy,
>
> This sounds to me as though you are seeing glass degradation. 
>  Sometimes called glass disease, this phenomena manifests as 
> iridescence and flaking and is caused by a leaching out of the alkali 
> component of the glass.  I have only seen this on archaeological 
> glass, but it's possible that this is what's happening to your 
> glassware.  What kind of glassware do you have?  And is it very old?
>
> *Evelyn Ayre*
> Conservator - Intern | Restauratrice - Stagiaire
> Preservation Services | Services de préservation
> Canadian Conservation Institute | Institut canadien de conservation
> Department of Canadian Heritage | Ministère du Patrimoine canadien
> 1030 Innes Road | 1030 chemin Innes
> Ottawa ON Canada K1B 4S7
> evelyn.ayre at pch.gc.ca <mailto:evelyn.ayre at pch.gc.ca>
> Telephone | Téléphone  1 (613) 998-3721 ext | poste 235
> Facsimile | Télécopieur 1 (613) 998-4721
> Government of Canada | Gouvernement du Canada
>
> Inactive hide details for Mandy Reid ---10/03/2014 01:20:01 
> AM---Apologies that this is off the current topic, but does anyone 
> Mandy Reid ---10/03/2014 01:20:01 AM---Apologies that this is off the 
> current topic, but does anyone know what the shiny, flaky and slightl
>
> From: Mandy Reid <Mandy.Reid at austmus.gov.au 
> <mailto:Mandy.Reid at austmus.gov.au>>
> To: "'nhcoll-l at mailman.yale.edu'" <nhcoll-l at mailman.yale.edu 
> <mailto:nhcoll-l at mailman.yale.edu>>,
> Cc: Anders Hallan <Anders.Hallan at austmus.gov.au 
> <mailto:Anders.Hallan at austmus.gov.au>>
> Date: 10/03/2014 01:20 AM
> Subject: [Nhcoll-l] Translucent residue
> Sent by: nhcoll-l-bounces at mailman.yale.edu 
> <mailto:nhcoll-l-bounces at mailman.yale.edu>
>
> ------------------------------------------------------------------------
>
>
>
>
> Apologies that this is off the current topic, but does anyone know 
> what the shiny, flaky and slightly mirror-like reside is that forms on 
> the sides of glassware that has previously contained 5-10% 
> seawater/formalin that has been buffered using sodium bicarbonate? It 
> is very difficult to wash of glassware as a rule but it sometimes 
> flakes off in small particles.
>
> I am wondering whether it is a harmful if inadvertently inhaled.
>
> Any ideas?
>
> Thanks
> Mandy
>
> *Dr Mandy Reid*
> Collection Manager, Malacology, Australian Museum Research Institute
> *Australian Museum* 6 College Street Sydney NSW 2010 Australia*
> t* 61 2 9320 6412 *f* 61 2 9320 6253
> *Visit*: http://www.australianmuseum.net.au 
> <http://www.australianmuseum.net.au/>*
> Like*: http://www.facebook.com/australianmuseum*
> Follow*: http://www.twitter.com/austmus*
> Watch*: http://www.youtube.com/austmus
> Australian Museum
> *Inspiring the exploration of nature and cultures*
>
> Book Online tyrannosaurs.com.au <http://tyrannosaurs.com.au/>
>
> Click here to read the Australian Museum email disclaimer:
>
> http://info.austmus.gov.au/disclaimer.htm
>
> _______________________________________________
> Nhcoll-l mailing list
> Nhcoll-l at mailman.yale.edu <mailto:Nhcoll-l at mailman.yale.edu>
> http://mailman.yale.edu/mailman/listinfo/nhcoll-l
>
> _______________________________________________
> NHCOLL-L is brought to you by the Society for the Preservation of
> Natural History Collections (SPNHC), an international society whose
> mission is to improve the preservation, conservation and management of
> natural history collections to ensure their continuing value to
> society. See http://www.spnhc.org for membership information.
>
>
>
> _______________________________________________
> Nhcoll-l mailing list
> Nhcoll-l at mailman.yale.edu
> http://mailman.yale.edu/mailman/listinfo/nhcoll-l
>
> _______________________________________________
> NHCOLL-L is brought to you by the Society for the Preservation of
> Natural History Collections (SPNHC), an international society whose
> mission is to improve the preservation, conservation and management of
> natural history collections to ensure their continuing value to
> society. See http://www.spnhc.org for membership information.

-- 
Dirk Neumann

Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de

Postanschrift:

Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Labor
Münchhausenstr. 21
81247 München

Besuchen Sie unsere Sammlung:
http://www.zsm.mwn.de/ich/

---------

Dirk Neumann

Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de

postal address:

Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Lab
Muenchhausenstr. 21
81247 Munich (Germany)

Visit our section at:
http://www.zsm.mwn.de/ich/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.yale.edu/pipermail/nhcoll-l/attachments/20140311/8f91e436/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 105 bytes
Desc: not available
Url : http://mailman.yale.edu/pipermail/nhcoll-l/attachments/20140311/8f91e436/attachment-0001.gif 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 1869 bytes
Desc: not available
Url : http://mailman.yale.edu/pipermail/nhcoll-l/attachments/20140311/8f91e436/attachment-0001.png 