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From Indiana's FACET guide:

Until World War II this wire
was typically made of steel and susceptible to rust. Later, wire was
made of a type of
stainless steel—which is a stable and durable material— that was
manufactured specifically
for recording.

Because non-stainless steel wires are susceptible to rust or
corrosion, and because
non-standard size and playback speed wires are not compatible with
standard machines,
these items are at greater risk.

Non-stainless steel wires are rare but, if found, may exhibit
corrosion that makes playback
more difficult. Even stainless steel wires may be subject to some oxidation.

http://www.dlib.indiana.edu/projects/sounddirections/facet/facet_formats.pdf

Marcos

On Wed, May 6, 2009 at 8:15 PM, Angie Dickinson Mickle
<[log in to unmask]> wrote:
> The reference was to the spools themselves, not the wire on the spools.
>
> Angie Dickinson Mickle
> Avocado Productions
> Broomfield, CO
> www.avocadoproductions.com
> 800-246-3811
>
>
> Dan Nelson wrote:
>>
>> Its been  to many years since chemistry..but i believe you cannot
>> magnetize aluminum..... so the wire must have some sort of coating that
>> appears to be silver/aluminum  in color.
>> I have many spools of Webster and Silvertone/sears wire that look the
>> same.  The old Webster Chicago runs mechanically but the electronics need
>> re-capping >>>  ahh a job  for  later since i havent had any requests to
>> transfer wire lately.
>> dnw
>>
>> --- On Wed, 5/6/09, Angie Dickinson Mickle <[log in to unmask]>
>> wrote:
>>
>>> From: Angie Dickinson Mickle <[log in to unmask]>
>>> Subject: Re: [ARSCLIST] wire recordings - archival storage
>>> To: [log in to unmask]
>>> Date: Wednesday, May 6, 2009, 7:45 AM
>>
>> <snip>
>>>
>>> I have seen some spools that were bare aluminum (usually
>>> with no label), but you are right most seem to be pot
>>> metal.  Pretty awful getting the wire off when the rims
>>> have been broken.
>>>
>>> I will be paying more attention to these issues.  And
>>> if you uncover any more information, please let us know what
>>> you find.
>>>
>>> Very cool that the plant is still there.  It would be
>>> fun to drive passed the next time I'm in town.
>>>
>>>
>>> Angie Dickinson Mickle
>>> Avocado Productions
>>> Broomfield, CO
>>> www.avocadoproductions.com
>>> 800-246-3811
>>>
>>
>>
>>
>> __________ Information from ESET Smart Security, version of virus
>> signature database 4057 (20090506) __________
>>
>> The message was checked by ESET Smart Security.
>>
>> http://www.eset.com
>>
>>
>>
>>
>



-- 
Marcos Sueiro Bal
Audio Engineer
718.902.7441