A commercial material of lac dye (Fig. 1) was used.
Scoured and bleached cotton fabric (142 g/m2) was purchased
from Misr Spinning and Weaving Company, Mahalla El-
Kobra, Egypt. Before using, the fabric was treated with
a solution containing 5 g/l non-ionic detergent (Hostapal CV,
Clariant), at 95 C for 4 h. Then, the fabric was thoroughly
washed with water and air dried at room temperature.