Solubility that decreases with an increase in conditions such as temperature or added component, where an increase is expected as the usual case. In ternary liquid systems with coexisting phases, where the critical solution point is not a maximum on a ternary diagram, passing from a homogeneous mixture in which the composition of a given component is greater than that of the critical mixture to a heterogeneous mixture and back to a homogeneous mixture by altering the relative amounts of the two other components.