The Soundscriber SS-124 was advertised by Soundscriber as using a Mylar
based tape - hence polyester. Thank you to all that have replied to my
inquiry. I am familiar with the common issues related to magnetic tape
stock - SS, VS, and so forth. The climate here in Alaska is, in the
main, actually favorable to the long term storage of film and magnetic
mediums. 9 times out of 10 I can tell when media has been stored out of
state because in most cases it has deteriorated much faster than it
would have if it had spent its "life" in Alaska. So I would ask again
about the consolidation of delaminataed coatings on a polyester base and
what techniques might be helpful. References to papers or commentaries
on the subject would be greatly appreciated by me, and I suspect by many
Thanks again. --greg
On 7/16/13 9:03 PM, Jim Lindner wrote:
> In the original question Greg said that these were 2" Helically recorded tapes from the 1960's on a SoundScriber - typically these types of recordings were used for air checks or dictation/transcriptions or logging phone calls over very long time periods. I am pretty sure that the base stock would be Polyester and not Acetate.
> That said, I would agree that baking is likely not advisable if delimitation is occurring (or even if it isn't with something as finicky as this), at least without a great deal of inspection and work first to try to figure out precisely what is going on and to develop a treatment plan for the specific problem.
> Consider - this is polyester that has helical tracks (long ones on 2" tape) moving VERY slowly for recording, that has been stored in non-temperature controlled environment in Alaska for about 40 - 50 years. You can imagine what the material has done over time - now track that with a period device - forget AST or any fancy technology to make sure that the head is where the track happens to be based on the distortion that has occurred. Yikes!
> I would definitely not bake these tapes until I tried a whole bunch of other things first.
> Jim Lindner
> Email: [log in to unmask]
> Media Matters LLC.
> 450 West 31st Street 4th Floor
> New York, N.Y. 10001
> eFax (646) 349-4475
> Mobile: (917) 945-2662
> Media Matters LLC. is a technical consultancy specializing in archival audio and video material. We provide advice and analysis, to media archives that apply the beneficial advances in technology to collection management.
> On Jul 16, 2013, at 7:54 PM, Tom Fine<[log in to unmask]> wrote:
>> Totally agree with Matt on this one. The WORST thing you can do to acetate is make it hotter and drier.
>> -- Tom Fine
>> ----- Original Message ----- From: "Matthew Sohn"<[log in to unmask]>
>> To:<[log in to unmask]>
>> Sent: Tuesday, July 16, 2013 6:29 PM
>> Subject: Re: [ARSCLIST] Conservation question: oxide delamination and consolidation
>>>> Whoa - wait a minute.
>>>> Isn't binder hydrolysis (sticky shed) totally different than binder delamination? Would you really want to bake tapes with oxide>delamination???? Some tapes may have sticky shed so bad that it appears to be "delaminating" as you play them, but I'm not so sure that>you'd want to bake tapes where the binder is actually flaking off of the tapes just by handling them. I have not yet had to work with true>binder delamination (and hope I never will) but from what I know, that's a totally different animal not to be to confused with sticky>shed!!! (and I've yet to see anyone out there reveal any simple solution to easily fix or stabilize binder delaminated tapes). Just my two>cents. Suzanne if you have more information, please share it!
>>>> John Schroth
>>> The only binder delamination I have encountered have been on very old acetate-backed tapes. It seems to me that it is a lack-of-humidity problem that may or may not be remedied by placing the tape(s) in a high humidity chamber for a long period of time (think weeks or months) before attempting to play. I would never bake an acetate-based tape.
>>> -Matt Sohn
Alaska Moving Image Preservation Association (AMIPA)
greg /at/ amipa.org
The Alaska Moving Image Preservation Association is a 501(c)(3) non-profit dedicated to media preservation and education to ensure long-term access to Alaska’s moving image heritage.