Kodak, some of which seems to use a different plastic base.
Steve Smolian
----- Original Message ----- From: "Casey, Michael T"
<micasey@xxxxxxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxx>
Sent: Thursday, January 05, 2006 8:47 AM
Subject: Re: [ARSCLIST] Risk assessment tool--off brands
What off-brand tape stocks would you consider to be at greater risk than
the standard Ampex/Scotch products? Shamrock? Irish? I might add
Sarkes-Tarzian. Are there others that are consistently problematic?
Mike
-----Original Message-----
From: Association for Recorded Sound Discussion List
[mailto:ARSCLIST@xxxxxxx] On Behalf Of Scott D. Smith
Sent: Wednesday, January 04, 2006 1:36 PM
To: ARSCLIST@xxxxxxxxxxxxxxxx
Subject: Re: [ARSCLIST] Risk assessment tool
To confirm Mike's findings, we have also encountered any number of
"white box" second grade tapes, mostly from the mid-fifties to early
seventies, which exhibit what may appear at first glance to be sticky
shed, but in fact suffer from other manufacturing problems (which is why
the ended up in the second grade bin!). Some of these may respond to
baking, others may not. (We just recently did a whole batch of tapes
recorded on 1/4" 1 1/2 mil.acetate stock from a company out of New York
called Magna-Reel. The stock appears to be second grade Ampex 611, with
very poor slitting and areas where the coating was applied unevenly, in
addition to some stiction).
Unlike stocks from Ampex, 3M, AGFA/BASF and others, whose
characteristics have been well documented, the off-brand tapes are a
challenge unto themselves. The tapes are seldom the same, even if they
appear to be from the same batch, and vary wildly in both their physical
and magnetic characteristics. All in all, a real nightmare for an
archivist.
My advice is to tread carefully, and don't do any treatment that may be
irreversible. (It should go without saying that you should never attempt
to bake an acetate/mylar based tape, but I thought it would bear
repeating-just in case a novice is reading through these posts!)
I would be most curious as to whether Bob could identify the two tapes
that wouldn't respond to baking, though.
Scott D.Smith
Chicago Audio Works, Inc.
Chicago, IL
*****************************
Mwcpc6@xxxxxxx wrote:
In a message dated 1/4/2006 11:33:25 AM Eastern Standard Time,
micasey@xxxxxxxxxxx writes:
Bob,
I'm curious about the two sss tapes that baking did not restore--any
thoughts on what might have been different with those two tapes
compared to the countless others that were succesfully baked?
Mike
***************
Not that it relates to Bob's case, but similar tapes that I've found
were green-box "Shamrock" reels in which the oxide did not seem sticky,
but partly smoothly transferred to the backing of the previous
layer, leaving effectively double coated tape.
Considering the source, this may have represented a catastrophic
manufacturing defect that was passed on to the "white box" market.
Mike Csontos
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