| http://www.w3.org/ns/prov#value | - ??solution???, ???soluble???, ???homogeneous???, and the like are to be understood as including not only true equilibrium solutions or homogeneity but also dispersions that show no visually detectable tendency toward phase separation over a period of observation of at least 100, or preferably at least 1000, hours during which the material is mechanically undisturbed and the temperature of the mate
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