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Subject: Testing AGFA yellow silver foil

Testing AGFA yellow silver foil

From: Wolfgang Hesse <rundbrief>
Date: Friday, March 26, 1999
    **** Moderator's comments: Please respond directly to the

Invitation to a users' test: Detection of harmful atmospheres for
photographs in archives and museums with yellow colloidal silver

Prof. Loebach from the University of Applied Sciences Cologne,
Germany, Department of Imaging and Media Technology, wants to carry
out a broad test with the AGFA yellow silver foil. This foil
contains a suspension of yellow colloidal silver on a polyester
base. The foil is used in the Photographic Activity Test for
enclosures too. The yellow silver acts as a very sensitive detector
for harmful atmospheres. If the silver is oxidized, and sometimes
reduced after the oxidation, a change from yellow to orange or
reddish colors occurs. This change can be measured with a
densitometer as a loss or increase in blue density. The test period
is envisaged for two years. The participants are requested to send
the foils back every half year for evaluation. There are no fees for
the test.

    Prof. Dr. Wilfried Loebach
    Fachhochschule Koeln
    Betzdorfer Strasse 2
    D-50679 Koeln
    wloebach [at] gauss__fo__fh-koeln__de
    +49 221 8275 2531 (12)
    Fax: +49 221 8275 2836

                  Conservation DistList Instance 12:76
                  Distributed: Friday, March 26, 1999
                       Message Id: cdl-12-76-015
Received on Friday, 26 March, 1999

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