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From the testing I've
reviewed, it's pretty clear that acetic acid will catalyze the breakdown of
acetate. As such, any method (that does not otherwise damage the acetate)
of removing traces of the acid from proximity to the tape should help
slow down the reaction. Testing has shown that acetate tapes will
decay slower if they are exposed to an air-flow that removes the residual acid
than will tapes that are in sealed containers that trap the acid inside.
Cardboard boxes would work well for the simple reason that they are not
air-tight and allow the acid to escape.
It's also important to have
a positive air pressure and air flow in the storage area so that the acid is
removed from the area. Removing the acid from the proximity of one tape
and then trapping it in a room can catalyze breakdown in other tapes stored in
the same space.
The Tuscan cans should work
ok as long as there is enough air movement in the room to allow some air to
circulate through the air vents and channels in the cases.
Peter Brothers
In a message dated 8/9/2004 5:11:12 PM Eastern Standard Time,
ArcLists@xxxxxxxxxxxxxxx writes:
I'm suspicious
that the traditional cardboard box is
functioning something like a
molecular sieve and absorbing some of the
acetic acid outgassing/effluent
from the tapes and retarding any vinegar
syndrome.
***************
Keeping tape in unsealed cardboard boxes does seem to help preserve
it.
"ProVent Audio's vented design allows active airflow through the
container to prolong the life of audio tape or 8mm film."
Everything I've seen indicates that you want to get the acetic acid out
of the room completely, not trap it near the acetate. Controlling the
room's humidity should prevent excessive drying.
The thickness of film base may be a factor in preventing the acetic acid
from leaving the material, explaining the faster deterioration, however the
compulsion to seal film in metal cans in sealed vaults certainly has a
greater effect. I've yet to see vinegar syndrome in any of my 40+
year old tape or film, however the material I just received from a
friend who was meticulous about "protecting" his material definitely does show
the effect (now stored in a separate room for airing).
Mike Csontos
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