SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of a cross- section through a "duet" sewing thread, which consists of 63% polyester and 37% cotton. As can be seen, the thread consists of many sub-threads; the more uniformly shaped ones are the polyester, the less uniformly shaped are the cotton. Magnification: X 900 at 8x10-inch size, X 130 at 35mm size.
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