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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 dry.

Cheers,

Richard


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
> solved).
>
> 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
http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.