To evaluate dyeing performance, the color strength (K/S) and CIELAB of the dyed samples were measured using a Hunter LabColor Quest XE spectrophotometer with illuminant D65 and 10◦observer. The K/S is calculated by the Kubelka–Munk equation,K/S = (1 − R)2/2R, where R is the reflectance, K is the absorption coef-ficient, and S is the scattering coefficient. The color difference is expressed as E* and is calculated by the following