In this study, the commercial cotton canvas (Barna Art, Barcelona, Spain) used consisted of a plain-woven fabric of 341 ± 1 g/m2 and presented 9 and 11 threads/cm in the warp and weft directions, respectively. The cotton sample was chemically degraded according to a protocol described elsewhere.32 The degree of polymerization (DP) of the prepared aged canvas was ca. 500. This DP value is low compared to the DP of canvases made of different proportions in bast, ramie, and linen fibers, which were considered in “good conditions” and present a DP superior to 1000.1

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