The effects of dye bath pH, salt concentration, ultrasonic power, dyeing time and temperature were studied and the resulting
shades obtained by dyeing with ultrasonic and conventional techniques were compared. Colour strength values obtained were found
to be higher with ultrasonic than with conventional heating. The results of fastness properties of the dyed fabrics were fair to good.
Dyeing kinetics of wool fibre with lac dye using conventional and ultrasonic conditions was compared. The time/dye-uptake
isotherms are revealing the enhanced dye-uptake in the second phase of dyeing (diffusion phase). The values of dyeing rate constant,
half-time of dyeing and standard affinity and ultrasonic efficiency have been calculated and discussed.