At yesterday’s guild meeting we did a burn test to see what “mystery” fibers were. Cotton oddly smelt a bit like burnt marshmallows. We practically made new plastic wire out of nylon.
It was a hot day but cool in the shade. I don’t know if I regularly would do a burn test to figure out what some fibers are but it was interesting to do once! Especially for blends. It was pretty accurate to the guide.