"Indigo blue is alive."
Indigo dye is showed charactaristic vivid blue by three steps. First, indigo blue attaches a cloth by the action of bacteria in the indigo solution. Second, that reacts to surrounding air. Third, that oxidizes. It goes on without respite for a whole year to control pH and the temperature of the indigo dye-vat that conserves the indigo solution. At "Konni" that is a dye works in Echigokatagai, sometimes let the indigo blue that's tired by dying drink Japanese sake. Thus, a craftsman share the same fate with an indigo blue.