I bought about 50 spools of thread from the estate of one of our quilting group. It is Mettler, mercerised cotton, silk finish. As she was a great quilter I never gave it a thought and now it seems there is a question of whether the thread is any good/strong enough to use. If you twist it around your fingers it is not hard to break. I asked two of the experienced quilters in our group. One said No. The other said Yes and broke a piece of the Aurifil that she was using. My most immediate problem is that I have One spool of the right colour to match the backing of a throw that I am trying to get finished. Someone has also told me that as it is "silk finish" it is meant for hand sewing and will not work in the machine. I bought this to use in my machine. I am frustrated
. Can you help? How can I tell if it O.K.? Is there a difference in what I can use for quilting rather than for piecing? Thanks everyone.