where C0 is the initial dye concentration (mg/L) and Ct is the dye
concentration after dyeing time t (mg/L), V is the volume of dye
solution (mL) and W is the weight of silk fabric (g) used.
However in this study we have estimated qt i.e. the amount
of dye on the dyed fabric at time t, by extracting the dye in
suitable solvent and then subjecting it to optical density
measurements.