PVA emulsion

Andrew Hart <ashart [at] email__unc__edu> writes

>I'm very interested in ideas or experience anyone can share about
>unexpected change in PVA from a single supplier, brown film, unusual
>odor, or mold.

Just as a comment, I once worked for a supplier of conservation
materials, and he developed a problem with his clay bole going mold
and black. After much fuss, and talking to a specialist, we
eventually found out that the mold had evolved a resistance to the
fungicide being used because we had used the same containers to
manufacture and store the bole for over 10 years. The solution
required more than just replacing all the containers and cleaning
the premises thoroughly. We also had to change to another fungicide,
although it was difficult to find one that was as tough on mold but
not on humans as the old fungicide.

Valerie Tomlinson


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                  Conservation DistList Instance 19:2
                 Distributed: Wednesday, June 22, 2005
                        Message Id: cdl-19-2-005
                                  ***