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Annick Lautraite states that there are only four undisputed surviving works originally painted by Raphael on canvas289 :
|The Trinity Standard
|The Sistine Madonna
She omits La Donna Velata which the Pitti describes as painted on canvas (dipinto su tela)290, and Putscher, who examined the painting out of the frame writes of Originalleinwand (original canvas)291. Both Camesasca292 and de Vecchi293 state that it is on panel; yet other examples of misleading mistakes in standard reference books.
Sylvie Béguin294 cites Shearman and Emile-Mâle, who observe that the canvas of Baldassare Castiglione is unusually fine. Annick Lautraite gives a thread-count of the Louvre’s two canvases (Castiglione and the Double Portrait) which
“…on average, is 16 vertical and 19 horizontal to the square centimetre.”295
The thread-count of the Tondo is on average 22 vertical and 25 horizontal to the square centimetre. This again is an exceptionally fine-woven canvas.
The canvas for the Sistine Madonna was described by Schlesinger in 1823 as
“fine, put together from three bits, yet quite strong and sound.”296
Excerpt from Dr Murdoch Lothian's PhD thesis 'The Methods Employed to Provenance and to Attribute Putative works by Raphael'