I'm tagging on here because it seems pointless starting a separate thread for my thread query
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Years ago I inherited a large spool of very slippery silky thread. Probably sent in by a parent when my class was doing some sewing. I've re-discovered it and wonder what, if anything, I could use it for. It slides off the spool at the drop of a hat hence the plastic tube stuck in one end. I burnt a piece of it to try and ascertain the fibre content. It burned easily, being so thin, and was almost entirely consumed with a tiny amount of ash left over. Definitely no beading and I couldn't smell anything but it was a tiny sample.
I'm guessing it's silk and would gladly let someone have it if it's for machine embroidery or anything like that.