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Study of fibres
The study of the canvas provides information about a transfer of a mural painting that has been carried out in earlier times. Normally, the canvas which were used were in cotton, and the only way to verify it is through the analysis.
In this image we see a fiber torsion characteristic of the cotton. Therefore, we find that the warp of the second transfer canvas that was used is cotton.
Details on 40x magnification with the microscope.