2. Experimental
2.1. Pigment and fabrics
The phthalocyanine blue pigment (Fig. 1a) was provided by
Hangzhou Hongyan Co. Ltd., China. Scoured and bleached pure
cotton knit fabrics (180 g/m2, 20 tex single yarn) were offered
by Xinrong Textile Factory, China. The fabric was treated with a
solution containing 2 g/l nonionic detergent (DNS, Haiyi chemical
company) at 90 ◦C for 30 min prior to utilization. At last, the fabric
was taken from the bath and thoroughly rinsed with tap water, and
then dried at room temperature.