| http://www.w3.org/ns/prov#value | - The particles must be of a size so they can be suspended in the liquid medium, either with or without the use of ultrasonification, and generally the particles have a size range between about 0.05 micron and about 10 microns, although preferably particles about 2 microns or less are used and most preferably the particles are of a size not greater than about 1 micron.
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