The veil is 17 centimeters long and 24 centimeters wide, and made of rare, sheer “sea silk” fiber from mollusk called “byssus,” usually found in the tombs of Egyptian pharaohs. The most striking thing about the veil is its transparency. The image remains perfectly visible from either side, yet under certain light, the image disappears.

Pictures at link.

http://www.philstar.com/arts-and-culture/2017/11/21/1761066/grotto-jesus-burial-cloth-replica-draws-pilgrims-nueva-ecijahttp://www.philstar.com/arts-and-culture/2017/11/21/1761066/grotto-jesus-burial-cloth-replica-draws-pilgrims-nueva-ecija