Archived posting to the Leica Users Group, 1998/09/04

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Subject: Re: [Leica] Re: Agfacolour fading
From: Eric Welch <>
Date: Fri, 04 Sep 1998 08:14:29 -0500

At 05:47 AM 9/4/98 -0600, you wrote:

>Why is this?  You would think that in a glass mount, the slide is protected
>against atmospheric pollution and UV light.
>   In Camera Techniques two issues back, Ctein discusses printing-out
>problems he found with Agfa RC papers when they were stored in sealed
>frames.  Are the same kinds of processes that affect print papers
>responsible for the deterioration of glass-mounted slides?

Exactly. 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.
- -- 

Eric Welch
St. Joseph, MO

It's hard to make a comeback when you haven't been anywhere.
- - Written in the dust on the back of a bus. Wickenburg, Arizona