Quote Originally Posted by figheadair View Post
I very much doubt that it would be silk. First and foremost, silk is much more expensive than wool so I cannot see why that would be used. Secondly, silk doesn't shrink like wool and would cause the selvedge to distort in the finishing process.
Yeah, I thought silk might be a long shot. I did the washing in cool water so the wool wouldn't shrink. I was just trying to see if the black marker would wash off. The change in the white thread was a surprise to me. It did not appear to shrink in length, but it just got narrower and less obvious. I may go back and pull some more of that white thread out so I can test it over a flame to see if it melts versus burns to ash.