In this hysteresis loop test, the sample is subjected to increasing shear and then reducing shear. The results give an indication whether the sample is thixotropic. Sample A has a high degree of thixotropy, so a loop is seen between the UP and DOWN curves, i.e. the samples behave differently before and after shearing.
Sample B appears to have only a shear thinning nature, as the UP and DOWN curves almost overlay each other. Traditionally, users have related the degree of thixotropy to the magnitude of the integrated loop area, although there are now other techniques as indicated below which give more meaningful results.