Abstract
Polyester fabrics are successfully dyed with indigo dye by controlling the ratio of sodium hydrosulfite and sodium hydroxide concentration in the dyebath solution, because non-ionic reduced indigo has a higher affinity for polyester fabrics than ionic reduced indigo. The value of total K/S increases with increased dyeing temperature. The color difference of indigo dye in the polyester and cotton fabrics is discussed interms of a reflection spectroscopic analysis. The difference in the maximum wavelength of indigo color for polyester and cotton fabrics is about 55 nm. Rub fastness on polyester dyed with indigo is superior to that on cotton.
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