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A phenomenon observed in some of the pseudoplastic fluids is the change in viscosity after an applied shear. If a pseudoplastic fluid is not thixotropic and a constant sheer stress is applied on it (i.e., stirring at a constant speed), its viscosity drops and keeps constant. On the other hand, if fluid is thixotropic, viscosity drop continues after a homogenous stirring is reached. When stirring stops, viscosity of a non-thixotropic fluid rises to its steady value, whereas, thixotropic fluid may need minutes, hours even days to recover its original viscosity.
See Also Shear thinning fluids, Pseudoplastic fluids