Yes, I think the film research has concentrated on NITRATE, and I think the reason it's kept
freezing is to keep it chemically stable so it doesn't combust, no?
-- Tom Fine
----- Original Message -----
From: "Richard L. Hess" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, March 01, 2015 11:50 AM
Subject: Re: [ARSCLIST] Distressing data point for upcoming ARSC tape playback workshop
> Hi, Tom,
> I think the research has been completed for FILMS and that below-freezing is good with no side
> effects that you say tape is suffering from.
> You do raise the interesting question that what may be good for cellulose NITRATE is not
> necessarily good for cellulose ACETATE.
> The point I was trying to make was that slightly cold and dry might be worse than very cold and
> On 2015-03-01 11:20 AM, Tom Fine wrote:
>> Hi Richard:
>> I worry that below-freezing storage of acetate media may freeze-dry it
>> out and make it so brittle that eventually it has no plasticity. If
>> super-cold/super-dry storage staves off severe sticky-shed and it can be
>> proven to really do that over time, then I would say it's the way to go
>> on that quantity of polyester-backed tape prone to sticky-shed (I've
>> heard estimates of 25-33% of tapes in vaults; I'd say it's probably
>> closer to 25% given the long history of tape recording before polyester
>> back-coated tapes, the fact that not all polyester back-coated tapes
>> develop sticky-shed, and the fact that there is no consistent data
>> showing that "post-sticky-shed" formulations didn't solve the problem,
>> and tape was used for quite a while after the problem was said to be
>> It may well be that sticky-shed tapes need to be stored in a special
>> way, by themselves. Much like nitrate films (maybe even in the same
>> vaults, because I think they both need the same storage conditions).
>> Everything else should probably be stored in somewhat warmer, somewhat
>> wetter conditions. But, we're all just speculating until there's more
>> reliable science on this. I do speak from decades of experience owning
>> and using old acetate tapes, however.
>> -- Tom Fine
> Richard L. Hess email: [log in to unmask]
> Aurora, Ontario, Canada 647 479 2800
> Quality tape transfers -- even from hard-to-play tapes.