Originally Posted by BKrenning
Wrinkle test is good also as long as you're sure it's not silk or rayon. Scrunch it up and see if it wrinkles. It not, it's not 100% cotton, rayon or silk--they all wrinkle.
This is the easiest, quickest, least-likely-to-get-you-arrested test.
Wad a bunch of it up tight and release it. Polyester fibers were invented to prevent wrinkling...you can use that very trait to determine when there is any in a blend.
Also look at the cut edge; blends tend to fray differently, with longer, straighter threads/fibers.
Jan in VA