Method of improving fastness in mineral dye

The present invention pre-treatment step of immersing a yeommul agar or soy milk quality mineral dye by increasing the color fastness, while maintaining the dyeability improving key is related to a method, a method of dyeing by further comprising alum or agar in the salt solution, before dyeing after comprises a dye or provides a method which comprises the steps of immersing the agar or gelatin.