Patent ID: 8585783

Claim:
A natural dyeing method of a fiber comprising: an indigo plant pigment elution operation (S 1 ) of eluting a water-soluble indigo plant pigment by filling a container with an indigo plant and water having a predetermined temperature and extracting the mixture of the indigo plant and the water for a given period of time; an indigo plant dye preparation operation (S 2 ) of preparing an indigo plant dye by injecting lime powder and air into the indigo plant extract eluted in the indigo plant pigment elution operation (S 1 ), decanting water when an insoluble indigo plant pigment formed by bonding oxygen to the indigo plant pigment is condensed and precipitated due to cohesion caused by a chemical reaction of the lime powder and removing moisture from the insoluble indigo plant pigment condensed with the lime powder; an indigo plant dye solution fermentation operation (S 3 ) of reducing the insoluble indigo plant pigment into a water-soluble indigo plant pigment by aging a dye solution, which is prepared by mixing caustic soda with the indigo plant dye prepared in the indigo plant dye preparation operation (S 2 ), at a predetermined temperature for a given period of time, adding a sugar and performing microbial fermentation on the dye solution for a given period of time; and a fiber dyeing operation (S 4 ) of dyeing a fiber by immersing the fiber in the indigo plant dye solution microbially fermented in the indigo plant dye solution fermentation operation (S 3 ) for a given period of time.