[Nhcoll-l] Formalin and glass vials

[Simon Moore]

Hi Mandy,

If this is a formalin residue then it’s likely a para-formaldehyde polymer. If so, then it will gradually dissolve away in preserving strength alcohol but it takes a week at least.  

If not, then it might also be a reaction, over time, of the formalin with the glass whereby the formalin slowly leaches alkali from the glass. If this is the case, then I’m regretfully stumped but someone else may know better!

With all good wishes, Simon

Simon Moore MIScT, RSci, FLS, ACR
Conservator of Natural Sciences and Cutlery Historian,

www.natural-history-conservation.com




> On 3 Mar 2021, at 05:59, Mandy Reid <Mandy.Reid at Australian.Museum> wrote:
> 
> Hi
> I am wondering if anyone has a simple method for cleaning glass vials that have become clouded or appear to contain flaky reside after they have been in formalin solution for some time.
>  
> We are currently switching our specimens from formalin to ethanol and don’t want to wastefully discard reusable glass that is still intact and strong, but clearly etched in formalin solution over time.
>  
> I am currently trying dilute bleach. Any other suggestions other than a lot of scrubbing?
>  
> Thanks
> Mandy
>  
>  
> Dr Mandy Reid
> Collection Manager | Malacology
> Australian Museum  1 William Street Sydney NSW 2010 Australia 
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