feeding at least one substantially untwisted multifilament ultrahigh molecular weight polyolefin yarn coating said substantially untwisted multifilament yarn with a colorant twisting said coated multifilament yarn and heating said twisted multifilament yarn to a temperature and for a time sufficient to at least partially fuse adjacent filaments together while stretching said yarn whereby a colored monofilament fishing line is formed having improved color-fastness and abrasion resistance.
