Colorimetric study of traditional varnishes applied on paper exposing to aging tests
M. Durbán, T. Espejo, A. López-Montes, M. R. Blanc
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Base Information
Volume
V52 - N1 / 2019 Ordinario
Reference
51018:1-14
DOI
http://doi.org/10.7149/OPA.52.1.51018
Language
Spanish
Keywords
Colorimetry, varnish, paper, aging
Abstract
The use of varnishes as a final coat in graphic work fulfills an aesthetic and protective function. Over time, or due to adverse conditions, these varnishes undergo a series of degradations in their color that can distort the original appearance of the underlying work. Knowing the chromatic variations of these materials is essential for their selection as a conservation varnish. This work collects the results obtained from the colorimetric study carried out on a series of samples of paper with varnish exposing to different physical-chemical tests (humidity, immersion in water, dry heat and accelerated aging) tests that recreate adverse conditions to which this type of woks may be exposed as a consequence of its natural aging, the action of certain degradation factors or the restorative action. For this purpose, Somerset 100% cotton paper has been selected, which has been applied different varnishes of traditional use in graphic works: shellac, gum arabic, egg white, rosin and dammar. The color of these samples has been studied following the CIEL*a*b* 1976 system, calculating the colorimetric differences from the comparison between the reference samples and the samples after the physical-chemical tests.
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