Dyeing was carried out at different times between 20 and 40 min.
It is found that colour strength values rise with the increasing dyeing time up to 30 min and then decrease.
Results shown in Fig. 3 indicated that for a long time of dyeing insoluble impurities may cause sorption of dye on fabric along with dye, due to which low colour strength and dull shades are found from spectraflash spectrophotometer