Dielectric analysis with cyclic programmed RH was used to test the above samples, and the same RH program as for the neutron radiography experiment (20–75%RH, 25 °C) was employed. Three replicas were measured for each sample. The canvas samples (13 mm × 13 mm and ≈1 mm thick) pre-dried for at least 24 h using silica gel were measured at four different frequencies (0.3, 1, 3, and 10 kHz) by applying an alternating electrical field to the electrodes of a Lacerta Technology DS6000 Dielectric Analyser connected to the Lacerta Technology RH controller. The flat canvas samples were placed between the lower spring-loaded 33 mm diameter electrode and the upper fixed 10 mm diameter electrode. Adjusting the lower electrode position changes the spring pressure applied to the electrode and sample. This was set to the same position for all samples to ensure a consistent pressure was applied to all samples.

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