[Nhcoll-l] off-coloured EtOH

[Gregory Schneider]

I had that problem in recent years. We use 55 gallon steel drums. A while
back, I was convinced  the water mixed in the ethanol was oxidizing the
metal in the drum and giving it a "rust color". I switched to phenolic
lined drums, but eventually, the dilute ethanol started to discolor with
the light brown / orange color of the lining. I have recently purchased
LDPE plastic liners for our new 55 gallon drums for dilute solutions of
ethanol, but I haven't tried them yet.  Are your dilutions in metal
containers?

Best regards,
Greg

Greg Schneider
Division of Reptiles and Amphibians
Museum of Zoology
Research Museums Center
3600 Varsity Drive
University of Michigan
Ann Arbor, Michigan 48108

734 647 1927

ges at umich.edu



[image: Description: Description: logocolor]

www.ummz.lsa.umich.edu/rep_amph/index.html


On Thu, Mar 19, 2020 at 11:58 PM Haff, Tonya (NCMI, Crace)
<Tonya.Haff at csiro.au> wrote:

> Hi again,
>
>
>
> On a separate topic, I wonder if any of you have had any experience with
> unused EtOH developing a yellowish colour? We had this happen to a freshly
> made batch of 70% EtOH recently, and none of us are clear on what happened
> or if this is a problem or not.
>
>
>
> Thanks,
>
>
> Tonya
>
>
>
> ---------------------------------------------------------
>
> Dr Tonya Haff
>
> Collections Manager
>
> Australian National Wildlife Collection
>
> National Research Collections Australia, CSIRO
>
> Canberra, Australia
>
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>
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