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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:41 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Color changes in the artwork materials aged by uv radiation
Authors:
N. Herascu, M. Simileanu
Affiliation:
National Institute of Research-Development for Optoelectronics INOE 2000
E-mail
herescu@inoe.inoe.ro
Keywords:
color, colorimetric parameters, artwork,UV aging
Abstract:
Color is the main essence of most artworks: paintings, stained-glass windows, miniatures, statues, monuments, historical textile. Because some constituents of artwork materials are sensitive to UV light the discoloration of its will be occurs. Consequently, it directly affects the appearances of the art objects.
The changes in art objects color caused by ageing of artwork materials is one of the major problems encountered by artists, conservators and museum curators. Thus, for conservation and restoration purposes it is important to monitor color changes induced by the natural ageing and cleaning procedures using UV radiation.
Thus, the goal of our study was to evaluate the effects of direct UV exposure of certain artwork materials using color spectroscopy.
The samples were artificially aged under the UV light (254 nm) under constant environmental and room conditions (temperature - 22 ºC and relative humidity -55% RH).
Prior and after artificial UV aging, the reflectance spectra of all samples were acquired using a JASCO V-550 spectrophotometer. To quantify the color changes that may occur because of UV exposure the colorimetric parameters were determined using the CIE L*a*b* and CIE LCH procedures.
Thus, has been show that accelerated and artificial UV aging with 254 nm lamp yields to different (photochemical) effects show by color appearance changes as a strong discoloration of the inorganic/organic artwork materials comparing with those of the UV laser irradiation used in the cleaning procedure.
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