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Assessing the pH and DP of canvasses with NIR spectroscopy
Oriola Folch, Marta
Universitat de Barcelona
The canvas support in easel paintings is composed mainly of cellulose. One of the maindegradation paths of cellulose is acid-catalysed hydrolysis, which means that in an acidic environment (low pH), its degradation proceeds at a faster rate (Strlič et al., 2005).The main effect of acid-catalysed hydrolysis is the breaking up of the polymer chains,measured by the “Degree of Polymerisation” (DP). The lowering of the DP value impliesa lower mechanical strength of the textile (Scicolone, 1993), and thus this parameter canbe used to monitor degradation. Knowing these two parameters can, therefore, be veryinformative regarding the condition of the canvas support.
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Conservació i restauració d'obres d'art
Pintura sobre tela
Conservation and restoration of art objects
Textile painting
cc-by-nc-nd, (c) Oriola Folch, 2013
Universitat de Barcelona. Facultat de Belles Arts. Secció de Conservació-Restauració

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