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Subject: Paraloid B-72

Paraloid B-72

From: Perry Hurt <phurt<-a>
Date: Monday, November 21, 2005
Eleonore Kissel <eleonore.kissel [at] conservationpreventive__com>

>... 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?

It may be that titanium white is suggested as a white bulking
material because of its chemical stability in most situations.  Zinc
white is not recommended for resin based application because of its
observed adverse affect on inpainting.  Over time zinc white
fractures the resin matrix causing the inpainted area to appear much
too light or white in color.

Perry Hurt
Conservator for Regional Conservation Services
North Carolina Museum of Art
Fax: 919-733-8034

                  Conservation DistList Instance 19:28
                Distributed: Tuesday, November 29, 2005
                       Message Id: cdl-19-28-005
Received on Monday, 21 November, 2005

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