"carding brushes," are called cards in the fiber trades. They're much like cat or dog slicker brushes, except they're much larger and the teeth are bent. They're meant to straighten and smooth and align fibers like wool and cotton and silk, and to blend colors. They're available from weaving and spinning shops. If you tell me where you live, I may know a place.
Cards produce parallel fibers that aid in spinning into yarn. They don't break up the fibers into short bits. If you buy them at a fiber store, ask the folks there how to use them. It ain't as intuitive as it may seem. Steve, In Maryland http://stevebrettell.point2homes.biz -- _______________________________________________ Find what you are looking for with the Lycos Yellow Pages http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/default.asp?SRC=lycos10
