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[BKARTS] more on ortho-phenylphenol

If you are truly interested in the late 1980s to early 1990s take on
ortho-phenylphenol, then you might wish to read the peer-reviewed
research published in the Journal of the American Institute for
Conservation during that period. Ortho-phenylphenol was found to be of
very limited efficacy (ie not worth the risks) in JAIC vol. 25, No.1 pp.
49-55 (1986) and JAIC vol.29, No.2 pp. 153-168 (1990). People were
promoting it as a substitute for thymol.  It is still recommended for
sanitizing hard surfaces (workstations, vacuum nozzles, etc) when
working with moldy artifacts (although the ethanol can be used for that
too). It is fungistatic as mentioned by others (it can kill mold), but
not truly fungicidal (does not prevent new mold growth or eliminate
viable spores). One of the authors reminds us that nonviable,
fungicide-coated mold spores can be both allergenic and toxic anyway. 

Another study (fungi from the Ajanta caves) seemed to show efficacy in
the petri dish, but was not evaluated on paper artifacts
(Biodeterioration of cultural property: proceedings of the International
Conference on Biodeterioration of Cultural Property, February 20-25,
1989, held at National Research Laboratory for Conservation of Cultural
Property, in collaboration with ICCROM and INTACH. Agrawal, O.P. and
Dhawan, Shashi, Editors. Macmillan India Ltd. (1991), pp. 313-338)

Putting it into paste is basically a way of trying to weasel out of
cooking a fresh batch of paste. 

Valinda Carroll

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