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If it's like the discs I've seen, that mark reflects an original edit
decision, probably for a radio show. As an archivist, I'd have to weigh the
possible importance of the track against the information that would be lost
by removing the mark that identifies it as "out".  At the very least, I
would take a digital picture that shows the mark, hopefully you could store
it with any digital surrogate you produce. If you are determined to go
ahead, I'd second rehearsing the use of any solvents on a similar recording
that has less apparent value to your collection. YMMV.

Steve


Steve Greene
(301) 842-8923
historicity.co
An independent archival professional specializing in still photography,
moving images and recorded sound.


On Wed, Jul 31, 2019 at 5:00 PM Corey Bailey <[log in to unmask]>
wrote:

> All,
>
> Howard has a very difficult problem here because he is dealing with a
> lacquer disc (Preaching to the choir again).
>
> Howard: No matter what you do, it will affect the playability of the
> disc and the result will be more noise, less signal. Dennis Rooney's
> advice is good (test first, play later) as is Mickey Clark's. I have
> found that any type of cloth (including microfiber) will not get
> adequately into the grooves. It may take a stiff, fine bristle brush to
> accomplish that. Having repaired lacquers with paraffin wax (I often use
> sharpened Crayons), I will start the cleaning process with The Disc
> Doctor's Lacquer Cleaner. It doesn't remove all of the paraffin, but it
> will get the worst of it and certainly cleans the rest of the disc.
> Playing the disc a few times afterwards will often get the rest as the
> needle plows through the problem areas. Of course, the fidelity gets
> worse with each pass, but the affected area generally improves. so, to
> get the best end result, it may take some editing. I have often played
> the disc with 3 different size styli; Above the normal wear pattern, in
> the normal wear pattern and, below the normal wear pattern. Then, after
> a couple of passes of each, assemble edit for the best results. If you
> are doing this for yourself then, no problem. If this is client related,
> it can be a problem because time equals money and you are /always/ are
> expected to deliver.
>
> Best of luck with that,
>
> Corey
>
> Corey Bailey Audio Engineering
> www.baileyzone.net
>
> On 7/31/2019 12:02 PM, Dennis Rooney wrote:
> > Lighter fluid (heptane) has always been effective in removing adhesive
> from
> > acetate magnetic tape. It may work well on the discs but test an
> > unimportant are a first!
> >
> > DDR
> >
> > On Wed, Jul 31, 2019 at 2:49 PM Martin Fisher <[log in to unmask]>
> > wrote:
> >
> >> I've used Ronsonol lighter fluid to great effect in the past with no
> >> problems.
> >>
> >> Martin
> >>
> >>
> >> -----Original Message-----
> >> From: Association for Recorded Sound Discussion List <
> >> [log in to unmask]> On Behalf Of Howard Sanner
> >> Sent: Wednesday, July 31, 2019 1:39 PM
> >> To: [log in to unmask]
> >> Subject: [ARSCLIST] [AESHC] Cleaning grease pencil off discs
> >>
> >> I recently (as in yesterday) acquired some Speak-o-Phone discs. Unlike
> >> others I have, which are recorded on bare aluminum, these have a
> lacquer or
> >> acetate coating on an aluminum substrate. (I'm not going to strike a
> match
> >> to find out if it's acetate or lacquer!)
> >>
> >> One disc has two bands. The inner one has been drawn through using
> grease
> >> pencil in a pseudo-sine wave shape like you might use to scratch out a
> line
> >> of text. I'd like to remove the grease pencil and try playing this band.
> >> The band without grease pencil is Lily Pons on the Ford Sunday Evening
> Hour
> >> from 1941.
> >>
> >> So does anyone know how to remove grease pencil like this without
> damaging
> >> the disc?
> >>
> >> Thanks.
> >>
> >> Howard Sanner
> >>
> >
>