Blackstone Tweed, from Berroco, is a wool, mohair and angora blend with great pattern support -- Sweaters, Hats, Scarves, Wraps, even a Jumper. It knits at 4-1/2 stitches per inch.
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Croc-O-Dye , from Knit One, Crochet Too, a fingering weight variegated yarn in great colors. 65% Superwash Wool. 20% Nylon, 15% Silk. The accompanying Diagonal Lace Scarf pattern looks interesting.