Indigo dyed yarn may rub small amounts of blue on your hands as you work with it. This is called crocking, and is a normal part of working with indigo dyed items. Minor crocking does not indicate poor dye quality. Indigo that rubs onto your hands or clothes while working will wash out with soap and warm water. After knitting/crocheting and rinsing, crocking should cease. Avoid using wood and bamboo needles, as they may stain.