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Re: [ARSCLIST] Acetate tape discolours tape box
Thanks, David, for clarifying that.
One of the other challenges is we've seen A-D strips show acid in PVC
tapes, and don't understand that.
I have seen VS that is bad enough to affect playback and thank
goodness the tapes with it were 30 in/s full-track.
At 11:25 AM 10/19/2006, you wrote:
Richard, I wouldn't say that they don't work with tape, it's more
that they are calibrated for film. I'm pretty sure that somebody
from IPI is on this list (Doug Nishimura?) so maybe they could chime
in. The AD strips just detect free acidity and they will detect free
acidity in a tape box just as well as they will in film or in a jar
of pickles. What makes them useful for film is the color change will
tell you the point at which the decay becomes autocatalytic so you
can plan appropriately and deal with the worst stuff first and
ignore (or freeze or use molecular sieves with) the films with mild symptoms.
It would be nice to know if the colors were meaningful for tape, but
I'm not sure what it would tell us. Film has big problems from the
relatively small amounts of shrinkage found in advanced VS but I've
never seen (smelled?) VS in tape that was bad enough to affect playback.
David
Richard L. Hess wrote:
I have used the A-D strips and have a package, but the general
consensus is that they do not work reliably on tapes. I don't
recall all of the details that others have observed and someday I
will pursue this with IPI, but their focus is film.
Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.