This is an interesting sysnopsis of the various viewpoints of the Veil. Note that an expert that was consulted in Naples mentions nothing about letters from Raphael stating he was experimenting on Durer’s method.
http://www.shroud.com/pdfs/roberto.pdf
It does have various views about the pigments.
Note it says Vigo said the material is cambric. I believe this is not true. She said it was byssus with the use of the term as we know it today.