From: roger.kockaerts (roger.kockaerts@chello.be)
Date: 02/04/00-04:41:08 AM Z
Dear all,
If we talk about replacing bits and pieces of an original historic object we
automatically go into the ethics of photographic conservation-restoration.
When does an original object ceases to be original? You only replace
something when there is no other way out! Corrosion of cover glass has been
extensively studied by Susan Barger in: "Characterization of Corrosion
Products on Old Protective Glass, Especially Daguerreotype Cover Glasses",
Journal of Materials Science, 24, 1989.
All the best,
Roger Kockaerts
professor photographic conservation-restoration
at Hogeschool Antwerpen, Belgium
You are welcome to visit our homepage at: <http://home.tvd.be/cr25588/pH7/>
----------
>De : Wayde Allen <wallen@boulder.nist.gov>
>À : alt-photo-process-l@skyway.usask.ca
>Objet : Re: Dag info needed
>Date : Jeu 3 fév 2000 18:54
>
> I think one really should consider replacing the cover glass rather than
> just cleaning it. The problem is that the glass ages and softens. Then
> it begins to flake, droping very small pieces of glass down onto the dag.
> plate itself. I don't believe that cleaning and replacing the existing
> glass stops this process.
>
> NIST recently redesigned and built a new box for holding the United
> States Charters of Freedom (Declaration of Independance, Bill of Rights,
> etc.) due primarily to the deterioration of the cover glass. See
> http://www.nist.gov/public_affairs/Charter/charters_of_freedom_project.htm
>
> - Wayde
> (wallen@boulder.nist.gov)
>
>
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