As you likely know, United States currency is printed on a kind of fabric, not paper made from wood. It is made of recovered rags, known as rag paper: a combination of cloth and linen cloth. The resulting material is stronger, tougher, and feels better than wood-based paper.
You may have also noticed the red and blue fibers in the background of your U.S. bills. The very nature of rag paper makes it easier to add these and other kinds of security elements. Crane & Co are the only ones to have made this special paper for the United States for 140 years and counting.
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