| abstract |
PROBLEM TO BE SOLVED: To provide a dyeing method for a fiber capable of producing a dyed material which is rich in natural texture and is safe and which has excellent light fastness and washing fastness with good reproducibility and on a mass production scale. To provide. A method of dyeing a fiber pretreated with tannins using a dye, wherein the dye is selected from the group consisting of arginine, lysine and ornithine. A blue pigment obtained by coexisting, under aerobic conditions, an aglycone of an iridoid glycoside contained in at least one kind of an amino compound-containing substance and a plant belonging to the genus Gardenia, and dyeing the fiber in the presence of metal ions. Or a mordant treatment of the fibers with metal ions after dyeing the fibers. |