The Spanish, Italian and Portuguese Old Masters all painted on hand-woven patterned linen canvases. This 'first layer' has been given only sporadic study by art historians. I started deciphering the weaving draft of El Greco’s 'The Burial of the Count of Orgaz', in 2016. It recently culminated in authentic, hand-woven reconstructions of historic canvases.
first analyses show the difference...
...at first sight the textiles on the two pictures look very similar.
I did a first macro analyses, the firts picture is a tablecloth , owned by Jan Bustin and the seond picture is a canvas as used by a Portuguese painter (contributed to Francisco Correia)
In the textile of the canvas we find more lines which means it is woven with another threading and threadling of the loom.
I will make the draft and weave a reconstruction of both textiles.
source: a tela na pintura portuguesa, materiais e técnicas do século XV ao seculo XIX by Rita Maltieira