Of ﬂuctuating RH because of contraction in the canvas. Interference and ﬂattening of impastos conservators have also seenīulging and delamination in wax-resin treated paintings as a result However, the adverseĬonsequences were reported early on and many westernĮuropean conservation studios discontinued the use of the technique in the 1970s and 80s. Would be exposed to humidity ﬂuctuations. Relative humidity (RH) and was therefore previously thought of asĪ suitable material for impregnating or lining canvas paintings that Intermediate between untreated and wax-resin impregnated linen, which was ascribed to cracks in theĪ wax-resin mixture is virtually non-responsive to changes in In the aged lining canvas, moisture was taken up at a rate that was It was alsoĭemonstrated that BEVA gel treatment had very little effect on the rate of moisture sorption as there ﬁbers all are factors that characterize a painting at risk of climate related shrinkage damage. That a ﬁne weave canvas, tightly spun thread and the presence of wax-resin matrix in the voids between Whereas others stayed unaffected until a relative humidity of 82% was reached. Tension built up in some canvas samples already at 69% relative humidity Humidity was stepped up, but the wax-resin impregnated samples did so at a much slower pace than Both wax-resin impregnated and non-impregnated samples took up moisture when the relative This showed that there is no or littleĭelay from the time moisture is taken up by linen ﬁbers until swelling and the possible tension build up The samples were in equilibrium at 42% relative humidity atĢ3 ◦ C in DVS and tensiometer when the relative humidity was stepped to 69% RH while monitoring theĭevelopment of mass and tension respectively in the canvases. Samples of untreated linen, wax-resin impregnated linen and Berger’s Ethyl Vinyl Alcohol (BEVA) treated linen as well as an aged wax-resin treated

Using dynamic vapor sorption (DVS) and tensile tests. Present work, moisture sorption characteristics of wax-resin impregnated linen samples were measured Is therefore unclear how long treated paintings are protected from high moisture environments. However, the rate at which these processes happen are not well characterized and it These methods slow down moisture diffusion into the canvas and changes the corresponding development of tension. Wax-resin impregnation and lining are former widely used conservation methods. The Royal Danish Academy of Fine Arts, Schools of Architecture, Design and Conservation, EsplanaCopenhagen K, Denmark Of moisture sorption and tension in canvasĬecilia Gregers-Høegh a, Martin N. Journal of Cultural Heritage 40 (2019) 43–48ĭistorted oil paintings and wax-resin impregnation – A kinetic study

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