If you give it a sharp tug and it breaks, I would'nt use it. Also, I would be sure it is colorfast by putting some in a little water and allow it to sit overnight. If there is bleeding that occurred, no not use it. Also the fiber content is important to check. I have some old silk thread on wooden spools that I would not part with and use it rarely.
Last edited by RedGarnet222; 03-03-2015 at 10:52 AM.