...first trial to analyse the canvas that Velázquez used for his 'Supper at Emmaus'

...still many ??? marks and erasing !!!
published in Metropolitan Museum of Art Journals 'Dating Velázquez's 'The Supper at Emmaus'
by Charlotte Hale
https://www.metmuseum.org/pubs/journals/1/pdf/20320644.pdf.bannered.pdf