Additionally, mordant played an important role in dye-uptake and dye fastness.But the color-fastness to sunlight of natural dyestuffs did not meet the need of wearing.

• 另外媒染剂在提高天然染料的上染百分率、提高染色牢度方面也起到了一定的作用，但天然染料的日晒牢度还有待于进一步提高。