From: Greg Schmitz (gws1@columbia.edu)
Date: 02/15/02-05:59:00 PM Z
Bob and all: The general rule, as I understand it, in conservation
circles regarding the replacement of glass on daguerreotypes is to
leave original glass in place. DO NOT remove the glass. The reason
for this is that the daguerreotype and the glass are usually sealed
together to form a sealed "package." This package serves to protect
the dag from damage as well as environmental problems (eg. "bad"
gasses and rapid changes in humidity). Usually the glass is replaced
only if the original "package" is damaged. I only say this here to
discourage anyone who might be thinking about replacing the glass on
their dags. It can be done, but you really should get professional
help from somebody that knows how to it.
-greg schmitz
> ---------- Original Message ----------------------------------
> From: "Robert W. Schramm" <schrammrus@hotmail.com>
> Reply-to: alt-photo-process-l@sask.usask.ca
> Date: Fri, 15 Feb 2002 14:43:05 -0500
> >
> >Glass is not a solid and has some unusual properties. Old glass on
> >daguerreotypes tends to get darker with time and has to be replaced. Perhaps
> >this is a chemical reaction between the silver, mercury and glass.
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