[Leica] Re: slide degradation in glass mounts

["Doug Richardson" <doug@meditor.demon.co.uk>]

Eric Welch wrote:

>The glass in a slide mount keeps bad things out, but it also keeps
bad things in. And moisture, and fungus. Glass mounts are not for
long-term
storage. They're for using flat field projection lenses to project a
corner-to-corner sharp slide.

Looking back at the history of this slide collection for possible
sources of degradation some points come to mind:

The person who did the binding was a very heavy smoker.

The room the binding was done in was heated by a coal fire (in the
days when coal went coal - not smokeless fuels)


Of course, what the photgrapher regarded as his best work was
inevitably selected to be bound under glass. Luckily, he was a
procrastinator!

Regards,

Doug