i took apart a sampler on fine linen, dated 1806 and framed a very long time ago. it has tape (kind of like adhesive tape for wounds, all acid eaten)sewn around the edges with tiny,tiny stitches, like nobody could even do these days. the tape was still sticking to the decrepit piece of cardboard it was backed with. my question is, how important in terms of conservation is it to cut off the tape (which means cutting through all the minute stitches.) i want to mount the piece on rag mat and mat the edges. please give me your advice and ideas that may differ from my proposal. by the way, the piece is an heirloom from my family, so i won't be fooling with a customer's treasure.