Stabilita barevné vrstvy akvarelu v podmínkách umělého stárnutí

Abstract
As all materials, paintings’ paint layers succumb to natural aging. The impact of external factors on these layered systems has never been studied systematically. The main goal of this paper was to study behaviour of aquarelles as a selected representative of a technique of painting on paper under the conditions of artificial aging usually used in paper degradation studies (artificial aging in the presence of NO2, artificial aging by humid heat and thermal aging). Samples of aquarelles on a hand-made paper and on wood kraft paper made from pigments (Prussian blue, French ochre, ultramarine, Brazilian wood and buckthorn) and gum Arabic. After the exposure to the conditions of artificial aging, the prepared samples were reported to have changed in terms of their optical properties (the general colour differentiation, UV-VIS reflex curves, electron microscopy) and chemical composition (changes in pH, x-ray diffraction analysis, ATR-FTIR spectroscopy and Raman spectroscopy). Substantial changes were detected in the aquarelle samples containing verdigris pigment at all tested conditions of artificial aging associated with the detected changes of chemical composition. Significant impact of NO2 atmosphere on aquarelle samples with organic varnishes were experimentally proved, too.
© 2015 M. Ohlídalová, D. Krejčová, E. Dytrychová, H. Paulusová, A. Hostašová, published by Association of Czech and Slovak Corrosion Engineers
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