Saturated salt solutions to control humidity

A small church near Leipzig has got an altarpiece from 1520. It is
in very bad condition due to the rapidly changing climate during the
service. In order to prevent more damage a showcase has to be built.
The RH in the church in winter is around 60% and the temperature
around 2 deg. C, rising up to 15 deg. C over 12 hours, and slowly
decreasing over 2 day after the service and up to 22 deg. C in
Summer.

Now I am looking for a buffer material for the showcase. A saturated
solution of calcium nitrate could be it. See

    Julie Creahan
    Controlling Relative Humidity with Saturated Calcium Nitrate
    Solutions

        <URL:http://cool.conservation-us.org/
            waac/wn/wn13/wn13-1/wn13-106.html>

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Who has experience they would share about calcium nitrate in such
harsh conditions>

Oliver Tietze
Leipzig (Diplom-Restaurator, freelance)
Leipzig, Germany
+49 177 4773399


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