I would think mold, if only because of the thread-like appearance. In my
experience, binder hydrolysis by-products have a more crystalline
appearance. Is this the only affected tape? If all affected objects are the
same make and manufacture, it might suggest a manufacturing issue like
lubricant breakdown or binder issues. Do you know what storage conditions
it was subjected to? Long term exposure to RH over 50% would make me lean
further toward mold.
Office of Presidential Libraries
National Archives and Records Administration
On Thu, Jul 17, 2014 at 10:34 AM, Tre Berney <[log in to unmask]> wrote:
> Sorry- I¹ve been digging back through the list serve a bit, you¹re
> probably well beyond this by now.
> What was it? See you at grassroots, Karl?!
> On 7/1/14, 1:25 PM, "Karl Fitzke" <[log in to unmask]> wrote:
> >Anyone care to venture any guesses on these photos and what to do about
> >it? For the time being, I will hold my tongue and not prejudice the
> >jury. June 1987 recording on 3M/Scotch AVX90 cassette. There's eight
> >more where this one came from, recorded from 2nd through 3rd quarter of
> >1987, and two Scotch AVM cassettes recorded in early 1988, with similar
> >but significantly less on edge of tape.
> >Karl Fitzke
> >Audio Engineer
> >Macaulay Library
> >Cornell Lab of Ornithology
> >159 Sapsucker Woods Road
> >Ithaca, NY 14850
> >[log in to unmask]
> >Our Mission:
> >To interpret and conserve the Earth's biological diversity through
> >research, education, and citizen science focused on birds.