Historical Painting Techniques, Materials, and Studio Practice
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92. The fifty paintings examined by the authors reveal a clear trend. <strong>Painting</strong>s<br />
belonging to the Florentine <strong>and</strong> Sienese schools showed double-structured<br />
grounds of gesso grosso <strong>and</strong> gesso sottile, identified respectively as anhydrite <strong>and</strong><br />
dihydrate. Venetian examples showed a tendency towards single-structured<br />
grounds consisting only of dihydrate, as also observed in Gettens, R. E. <strong>and</strong> M.<br />
E. Mrose. 1954. Calcium sulphate minerals in the grounds of Italian paintings.<br />
Studies in Conservation (1):174-90. See in particular pages 180-83. The recent<br />
French examination finds that the examined paintings representing schools outside<br />
Tuscany are not numerous enough in their material to conclude anything<br />
general about the treatment of grounds in the rest of Italy.<br />
7. See note 2.<br />
8. The wording of the Codex Laurentianus is quoted from Lindberg, B. 0. 1990.<br />
Feta och magra limmer enligt Cennino Cennini. In Meddelelser om Konservering,<br />
165-87. Lindberg notes that the Codex Riccardianus in this passage has a slightly<br />
different, but not clearer wording than the Laurentianus. Lindberg points to the<br />
fact that the manuscript lacks interior punctuation.<br />
9. Cennini, 1960. Op. cit., 70.<br />
10. Unfortunately, this suggestion by Thompson, which in the author's opinion is<br />
wrong, is apparently reflected in numerous texts on medieval grounds. See, for<br />
instance, Straub, R. E. 1984. Tafel-und Tiichleinmalerei des Mittelalters. In Reclams<br />
H<strong>and</strong>buch der kiinstlerischen Techniken, Vol. I. Stuttgart Philipp Reclam, 156-<br />
57.<br />
11. See note 8.<br />
12. The various sources on gypsum are obviously not identical in their information<br />
on the relationship between the chemical composition of the gypsum <strong>and</strong> burning<br />
temperatures. Rompps Chemielexicon. 1979. Stuttgart, 575-76. See also, Mora,<br />
L., P. Mora, <strong>and</strong> P. Philippot. 1984. The Conservation of Wallpaintings. London,<br />
Butterworth, 39-47. Also see The Merck Index, 9th ed. 1976, 1707.<br />
13. Mora, et aI., op. cit. (note 12), 42.<br />
14. Lindberg, B. 0. , <strong>and</strong> B. Skans, in their experiments carried out at Institutionen<br />
fo r Konstvetenskap i Lund, have also observed that gypsum burned at 300 °C<br />
fo r two hours is still able to react with water. Lindberg, B. 0. , <strong>and</strong> B. Skans. 1990.<br />
Feta och magra limmar enligt Cennino. In Meddelelser om konservering, 184.<br />
15. See note 12.<br />
16. Gettens, R. J. 1954. A visit to an ancient gypsum quarry in Tuscany. Studies in<br />
Conservation (1):4, 190-92.<br />
17. Gettens <strong>and</strong> Mrose, 1954. Op. cit., (note 6), 185.<br />
18. Theophilus on Divers Arts. 1979. Translated by G. Hawthorne <strong>and</strong> C. S. Smith.<br />
New York, Dover Reprints, 27.<br />
19. A History of Technology, Vol. II. 1957. Oxford, The Clarendon Press, 118.<br />
20. The Painter's Manual of Dionysius of Fourna. 1978. Translated by P. Hetherington.<br />
London, 6. It appears from the directions in the Athos book, that right from the<br />
mining, it is important to choose the right kind of gypsum: " . .. see that you<br />
use only what is white <strong>and</strong> glistening."<br />
21. Lindberg, 1990. Op. cit. (note 8), 184.<br />
22. See note 6.<br />
23. Bomford, D., J. Dunkerton, D. Gordon, A. Roy, <strong>and</strong> J. Kirby. 1990. Art in the<br />
Making. London, National Gallery. See in particular pages 17-19.<br />
24. Martin, Sonoda, <strong>and</strong> Duval, 1992. Op. cit., 86-89, Table 2.<br />
25. It must, of course, be below 650 °C, which is the limit beyond which the anhydrite<br />
is no longer able to react with water.<br />
26. Martin, Sonoda, <strong>and</strong> Duval, 1992. Op. cit., 90. See also Dunkerton, J., <strong>and</strong> A.<br />
Roy. 1986. The Technique <strong>and</strong> Restoration on Cima's The Incredulity if S. Thomas.<br />
National Gallery Technical Bulletin (10) :4-27, especially page 5. See also Dunkerton,<br />
J., A. Roy, <strong>and</strong> A. Smith, A. 1987. The unmasking of Tura's "allegorical<br />
figure": A painting <strong>and</strong> its concealed image. National Gallery Technical Bulletin<br />
(11):5-35, especially 19.<br />
27. If a different crystal structure had existed fo r the dihydrate it would most likely<br />
have been included in the CSD (Cambridge Structural Database). This is not<br />
the case.<br />
28. It was quite obvious that not only was the burned gypsum (the anhydrite) much<br />
easier to grind than the raw gypsum, but the anhydrite burned at 700 °C was<br />
much easier to grind than the anhydrite burned at 400 0c.<br />
29. Cennini, 1960. Op. cit., 73.<br />
30. Martin, Sonoda, <strong>and</strong> Duval, 1992. Op. cit., 90<br />
64<br />
<strong>Historical</strong> <strong>Painting</strong> <strong>Techniques</strong>, <strong>Materials</strong>, <strong>and</strong> <strong>Studio</strong> <strong>Practice</strong>