Re: [ARSCLIST] shellac and acidity

["H. Duane Goldman" <thedoctor@xxxxxxxxxxx>]

Hi David,

The lacquer polymer is inherently more labile to acid catalyzed
decomposition than is shellac polymer.  Moisture will accelerate the
process for both.  The combination of moisture & a mild acidic environment
[such as found in the natural decomposition of old paper sleeves] will have
a greater potential to degrade lacquer than shellac.

All modern paper has a lower acid content than original sleeves and from a
safety standpoint replacement with plain text stock would be a vast
improvement.

Cheers,

Duane Goldman


At 11:47 AM 6/3/2003 -0400, you wrote:
> translation anyone?
>
> DS
>
> >>> nauck@xxxxxxxxx 06/03/03 11:17AM >>>
> I have just received lab results back from Terry Tullos Wayland, who is
> a
> paper conservator.
>
> He says:
>
> "Kurt, your DOF specimen is a moderately acidic pH 4.59."
>
> For what it's worth, there you have it.
>
> Kurt & Diane Nauck
>
> c/o Nauck's Vintage Records
> 22004 Sherrod Ln.
> Spring, TX  77389
>
> Website: www.78rpm.com
> E-Mail: nauck@xxxxxxxxx
>
> Phone: (281) 288-7826
> Fax: (425) 930-6862

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