When the agitation ceases there may be some reversal of the elastic deformation. These fluids undergo both elastic and viscous deformations when pumped. Viscoelastic fluids are formed of viscous and elastic components, generally a solvent and a polymer. Examples include cheese, yogurt, and marmalade. Irreversible liquids do not resume their original viscosity after agitation. Typical examples include rubber, latex, and mayonnaise. These fluids become less viscous with pumping, like thixotropic fluids, but immediately return to their original state when static again. Thixotropic fluids may take a considerable time to settle back to their original viscosity. These fluids become less viscous with pumping, for example: glues, non-drip paint, greases, cellulose compounds, soaps, starches, gelatinous food stuffs, and tar. Examples include some printer inks, lubricants, and certain suspensions of gypsum. These fluids show an increase in viscosity with agitation or pumping but unlike dilatant fluids, the viscosity continues to increase over time. Viscosity increases with agitation or pumping - typically observed in suspensions of fine particles such as cement, sand, lime or starch.
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