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Historical Painting Techniques, Materials, and Studio Practice

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ditional presence of metavivianite (a polymorph of vivianite) was indicated by<br />

this analysis.<br />

20. Richter, E. L. 1988. Seltene pigmente im Mittelalter. Zietschrift Jur Kunsttechnologie<br />

und Konservierung 2 (1):171-77.<br />

21. J. Darrah. 1987. Personal communication. Victoria & Albert Museum, London.<br />

22. Mineral deposits are fo und in Engl<strong>and</strong>, France, Germany, Italy, Portugal, Serbia,<br />

<strong>and</strong> the Ukraine, as well as in the United States <strong>and</strong> elsewhere. I am grateful to<br />

Mr. Peter T<strong>and</strong>y of the Natural History Museum, London for providing this<br />

information <strong>and</strong> for guiding me through the extensive range of samples in the<br />

collection. I am also indebted to Dr. Brian Young of the British Archaeological<br />

Survey for his enthusiastic interest <strong>and</strong> informed opinion on the provenance of<br />

the mineral.<br />

23. Watson, T. L. 1918. The color change in vivianite <strong>and</strong> its effect on the optical<br />

properties. The American Mineralogist 3 (8): 159-61.<br />

24. P. T<strong>and</strong>y. 1994. Personal corrununication. Natural History Museum, London.<br />

25. Following initial exposure of the colourless mineral, oxidation of one of the<br />

paired ferrous ions may occur at the surface <strong>and</strong> along crystal cleavages. The<br />

resulting intervalency charge transfer between the paired ions (now Fe2+ <strong>and</strong><br />

Fe3+) produces a blue color. Cressey, G. 1994. Personal communication. Natural<br />

History Museum, London.<br />

26. Hanzel, D., W Meisel, 0. Hanzel, <strong>and</strong> P. Glitlich. 1990. Mossbauer effect study<br />

of the oxidation of vivianite. Solid State Communications 76 (3):307-10.<br />

27. This information was kindly provided by Mr. David Perry <strong>and</strong> published by<br />

Park, op. cit.<br />

28. Oakeshott, W. 1981. The paintings of the Holy Sepulchre Chapel. Winchester<br />

Cathedral Record 50, plate 98a.<br />

29. Welford, P. 1991. Investigation of the phenomenon of dark flesh areas in English<br />

medieval wall painting. Diploma diss. London: Conservation of Wall <strong>Painting</strong><br />

Department, Courtauld Institute of Art, University of London.<br />

104<br />

<strong>Historical</strong> <strong>Painting</strong> <strong>Techniques</strong>, <strong>Materials</strong>, <strong>and</strong> <strong>Studio</strong> <strong>Practice</strong>

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