This is very interesting.
The Wikipedia article discusses acidic fumes/vapors are emitted by PVC
(the basefilm of some early 1940s and 1950s tapes) and polyurethane (a
eidely used binder) as well as wood, cork, non-archival cardboard,
paper, and cotton.
It is good to know it's a salt, but, unfortunately, the photo is behind
a login wall.
On 2014-07-23 3:41 PM, Karl Fitzke wrote:
> Still hoping to engage someone at Cornell with mass spectrometry
> capability, but today Mycologist Dr. Kathie Hodge of Cornell Plant
> Science generously put a few tapes under the microscope and gave us the
> representative photo at the link below. We looked even closer and it
> is surely some kind of salt.
> Kathie also shared the finding with a snail taxonomist, who said that
> this looks like Byne's disease.
Richard L. Hess email: [log in to unmask]
Aurora, Ontario, Canada 647 479 2800
Quality tape transfers -- even from hard-to-play tapes.