The Valle dei Mulini (Valley of the Mills), uphill from town, was for centuries Amalfi's center for papermaking, an ancient trade learned from the Arabs (who learned it from the Chinese). Beginning in the 12th century, former flour mills in the town were converted to produce paper made from cotton and linen, being among the first in Europe to do so. In 1211 Frederick II of Sicily prohibited this lighter, more-readable paper for use in the preparation of official documents, favoring traditional sheepskin parchment, but by 1811 more than a dozen mills here, with more along the coast, were humming. Natural waterpower ensured that the handmade paper was cost-effective, but catastrophic flooding in 1954 closed most of the mills for good, and many of them have now been converted into private housing. The Museo della Carta (Museum of Paper) opened in 1971 in a 15th-century mill; paper samples, tools of the trade, old machinery, and the audiovisual presentation are all enlightening.
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