The use of small amounts of dissolved copper in the dye bath to improve the dyeing of acrylonitrile fibers is described. Cuprous copper, obtained by reducing cupric acetate or sul fate in the dye bath, is the preferred form. The technique appears to be specific to acrylonitrile fibers, and is most effective with acid, direct, and soluble acetate dyes. Data on sorption of cop per and of other metal ions by acrylonitrile fibers and various non-acrylonitrile fibers are pre sented, and possible complexes between copper ions and polymeric acrylonitrile are postulated.
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