Draws attention to changes induced by vacuum pressure in the original painting texture. The interference effect of these wavy patterns is similar to the Moire patterns obtained by superimposing half-tone screens of different line count. This is an effect of the interaction between the weaves of 2 canvases which can be suppressed by introducing a surfacing veil, an intermediate layer of a non-woven fabric composed of synthetique fibers, compressed into a sort of felt. Suggests the use of a laminate of fiber-glass for stiffness and dimensional stability, covered on both sides by polyester surfacing veils against corrosions and abrasions. Notes that some non-woven ma terials have a pattern of their own. Describes a relining method using the fiber-glass-polyester surface veil laminate. -- AATA
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Gustav A. Berger (1966) studied this question.