Archived posting to the Leica Users Group, 1998/09/05

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Subject: [Leica] Re: slide degradation in glass mounts
From: "Doug Richardson" <>
Date: Sat, 5 Sep 1998 10:49:03 -0000

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
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