The regular sewing thread used did not have anything on the spool to indicate what it is made of. I put a flame to it and it flared and burned with no ash left behind. Could not detect any distinct odor. Asking and searching revealed that some common sewing thread is polyester or rayon. Some sewing thread is cotton, but that has a different kind of burn to it when subjected to flame. 
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~Doug~
AC010505 EAMUS CATULI! Audere est Facere THFC 19**-20** R.I.P. it up, Tear it up, Have a Ball
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