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» Film-Tech Forum   » Operations   » Large Format Forum   » Looking for DTAC soundtrack of THE GREATEST PLACES

   
Author Topic: Looking for DTAC soundtrack of THE GREATEST PLACES
Jeffry L. Johnson
Jedi Master Film Handler

Posts: 809
From: Cleveland, Ohio, USA
Registered: Apr 2000


 - posted 08-13-2015 12:52 PM      Profile for Jeffry L. Johnson   Author's Homepage   Email Jeffry L. Johnson   Send New Private Message       Edit/Delete Post 
My 35mm mag fullcoat (Kodak FPC thin stock) soundtrack for THE GREATEST PLACES (IMAX feature produced by Science Museum of Minnesota) has started shedding and clogging the "dubber" head. The residue left on the Teccon head is sticky and hard to remove.

Does anyone have a DTAC version of the soundtrack? I would like to borrow it and load it into my AE-1 for future playback.

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Bill Brandenstein
Master Film Handler

Posts: 349
From: Santa Clarita, CA
Registered: Jul 2013


 - posted 08-13-2015 08:55 PM      Profile for Bill Brandenstein   Email Bill Brandenstein   Send New Private Message       Edit/Delete Post 
That would be the way to go, but it sounds like you have sticky shed syndrome (is the stock 25+ years old?). You could make it playable again for a few months by baking it CAREFULLY in a convection oven at 135 degrees for 8 hours and letting it cool as slowly as possible. Google "sticky shed syndrome" etc and you'll find some expert advice on how to do this without destroying anything.

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Jeffry L. Johnson
Jedi Master Film Handler

Posts: 809
From: Cleveland, Ohio, USA
Registered: Apr 2000


 - posted 08-14-2015 08:54 AM      Profile for Jeffry L. Johnson   Author's Homepage   Email Jeffry L. Johnson   Send New Private Message       Edit/Delete Post 
The Greatest Places was a 1998 release. I started playing this print in 2001. So the soundtrack is at least 14 years old, Kodak FPC thin base.

Thanks, I was also suspecting sticky shed syndrome. I have 14 additional "dubber" feature soundtracks. This is the first and, I hope, the only one with this problem.

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Jeff Kane
Film Handler

Posts: 73
From: corpus christi, tx
Registered: Jun 2011


 - posted 08-18-2015 12:12 AM      Profile for Jeff Kane   Email Jeff Kane   Send New Private Message       Edit/Delete Post 
Don't bet on it. If the same binder was used in making the other fullcoat, it'll exhibit hydrolysis/sticky-shed as well. Carefully examine the other soundtracks, and if they're exhibiting shed, DO NOT PLAY THEM! As mentioned, baking can restore the tapes for a few weeks or months. That said, it requires a convection as opposed to conventional oven, and must be performed at a far lower temperature (~140 degrees) and higher accuracy than generally achievable by consumer-available ovens. Food dehydrators seem to work well but that's for a reel of 1/4" tape, not a 35mm reel of fullcoat!!

There's an article I can't find about baking tapes that described the process in full.

Richard Hess is one of the main authorities on just about anything that can go wrong with magnetic tape (and to some extent, mag on film). If you're so inclined, the linked article will provide quite a bit of background and info.

http://www.richardhess.com/tape/history/HESS_Tape_Degradation_ARSC_Journal_39-2.pdf

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Bill Brandenstein
Master Film Handler

Posts: 349
From: Santa Clarita, CA
Registered: Jul 2013


 - posted 08-18-2015 10:40 AM      Profile for Bill Brandenstein   Email Bill Brandenstein   Send New Private Message       Edit/Delete Post 
15 years is the youngest "oxide" I've heard of with sticky shed, but fullcoat at 18ips is a lot less forgiving than many open reel tapes (much less surface area per second), so we shouldn't be surprised.

Nice link for Richard Hess!

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