Lab values L*(3.879), a* (2.078), b* (0.798) given in Table 2 and Fig. 1 show that irradiation for higher time causes decomposition of dye as well as facilitates dye impurities to sorb on fabric due to which low colour strength is observed.
Hence the optimum condition of irradiation is 30 min dyeing.
UV radiation has not only saved time,
but also found to be cost effective.