Paraloid B-72

I would like to know if Paraloid/Acryloid B-72 has been known to
degrade due to important variations in temperature and/or relative
humidity. It is used extensively as a varnish when marking cultural
objects, but it is stable when used in institutions with a highly
fluctuating climate (i.e., museums which close during the winter;
field museums with operating machinery in the open air; museums
without an HVAC system and poor insulation; etc.).

Also, does anyone have an idea why titanium white (and not, for
instance, zinc white) has been recommended in previous the National
Parks Services Conserv-O-Gram, at least one Conservation DistList
posting (Stephen Koob, 2002) as well as personal communications I
have had with colleagues, when making a white opaque
Paraload/Acryloid B-72 solution?

Eleonore Kissel
In Extenso,
France


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                  Conservation DistList Instance 19:26
                Distributed: Saturday, November 19, 2005
                       Message Id: cdl-19-26-023
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