Unfortunately I haven't had time to follow this thread. Still, I'd like
to tell briefly about the other thread I started almost two months ago.
I tried desiccation of Compact Cassette tape with silica gel backs. I
now have two Basf
LH Super red label cassettes in two air tight plastic freezing boxes.
One of the tapes
is in one box as such and the box is filled with silica gel bags. The
other cassette tape
has been removed from the shell and is in the other box with silica gel
Unfortunately I haven't had the time to check the tapes. I will try to
find some time and
play the tapes to be able to tell if the silica gel treatment was any good.
When I first time tried this desiccation process, just after 7 days of
treatment the tapes played without squealing for about 30 minutes.
Without the desiccation they played only about 30 - 60 seconds before
they started to
squeal. The squealing affects the audio badly.