The cotton fibres were treated with the polymers at the optimum amounts obtained as described in Section 2.3.1. Then the untreated and the treated cotton fibres were dyed in lac dye solutions prepared in various NaCl concentrations for 3 h at 60 C.
The absorbance of lacdye solutions was measured using UVevis spectrophotometerto monitor the effect of NaCl on lac dye adsorption