About 15 tons of it on a recent day, imported from China, neatly pressed into mats and ready to ship to farmers and nursery growers who swear by the horticultural benefits of Blacker's hairy wares. The mats stored in southern Miami-Dade County are part of a world marketplace for human hair. Uses range from the obvious, such as false eyelashes and wigs, to the more obscure: it's a common raw-material source for l-cysteine, an amino acid frequently used in baked goods such as pizza dough and bagels
