S (Acrylic and polyester) Produces black smoke when burning. NYLON Slight odor, described as celery or sealing wax. Bead may be gray, brown or black. OLEFIN (polypropylene) Burns with odor of hot as - phalt or tar. The bead will be lighter colored than nylon, usually brown or gray. ACRYLIC Burns with an unpleas - ant, acrid odor. More @Wikipedia
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