A Note About Indigo
Indigo is unlike any other dye in the world. One could (and some do) spend an entire lifetime on the study and practice of indigo dyeing - leaving all other types of natural dyeing by the wayside.
During the dyeing process, the indigo forms a physical bond with the fiber, rather than a chemical bond as with other types of dyeing. In order to form this bond, two things must take place in the indigo dyebath to make the indigo soluble: a high pH and all of the oxygen must be taken out. Due to this type of bond, and to the fact that indigo is a larger molecule than other types of dye, it is common for indigo to rub off of one's hands when working with it. This is called crocking and is an inherent part of the process. It does not intimate a mistake or poor quality. Your hands turn blue, because it takes pressured contact to release the excess dye. Your handwork is part of the indigo dyeing process.
After knitting indigo dyed fiber, typically, the excess dye is gone, and the crocking will cease. If you find blue on your hands or clothing, it can be removed with hot water and soap. Please take care when using bamboo needles or wooden spindles with indigo dyed fiber or yarn, because they may become stained. The use of indigo creates a contemporary artifact - representing a multitude of communities from around the world, their ceremonies, and craft - a dying art being kept alive by you.