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Re: [ARSCLIST] Record Gunk

And hope that cleaning the disc doesn't reveal
flaking of the lacquer coating.

I think the above point could use a little more explanation. Instantaneous discs are not solid like vinyl or shellac. Instead, they involve a nitrocellulose layer that is adhered to either an aluminum, glass, or paper substrate. (Your example, i agree, is likely aluminum.)

In any case, you're going to want to examine the surface of the disc VERY closely and under GOOD light to determine whether or not there are cracks -- i mean tiny cracks -- in the cellulose layer before applying any liquids whatsoever as a cleaning agent. Allowing a liquid to seep into a crack in the cellulose surface compromises the adhesive and invites delamination.

Brandon Burke

On Oct 4, 2006, at 12:37 PM, David Lennick wrote:

Christie Peterson wrote:

We have a 33 1/3 rpm record from 1958 with what can only be described as
white gunk all over the surface. I'm looking for diagnoses and/or
advice about what to do with it (other than don't play it, which is
impossible in its current condition anyhow).

I've posted pictures here:
http://abacus.bates.edu/Library/aboutladd/departments/special/ Disc.jpg
http://abacus.bates.edu/Library/aboutladd/departments/special/ GunkUpClose.jpg
http://abacus.bates.edu/Library/aboutladd/departments/special/ Sleeve.jpg

We rubbed a small amount of the stuff off from the blank surface near
the label (visible in the pictures). It came off fairly easily, and had
a waxy texture.

This disc has been stored alongside a number of others that are all
fine, so I'm guessing this is something to do with the initial
manufacturing process, but not sure. Based on the label, I wouldn't be
surprised if this was some sort of instantaneous recording disc.



Does it feel as if it has an aluminum base and does it have at least one extra
hole visible under the label (possibly 3)? If so, it's definitely an
instantaneous disc and these often turn white, from palmitic acid exuded from the
lacquer coating. Windex (original, Blue, no generic imitations) works on
these..try some on a blank portion of the disc if there is one. Shpritz on, wipe
off, rinse with distilled water. And hope that cleaning the disc doesn't reveal
flaking of the lacquer coating.

Wrote this before looking at the image..if I had, I'd have seen the word
"Soundcraft" on the sleeve behind the disc, which confirms everything I wrote
above. Soundcrap discs are notorious for this stuff.


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