| http://www.w3.org/ns/prov#value | - Production of a substrate layer having satisfactory degrees of opacity and preferably voiding requires that the filler should be finely-divided, and the average particle size thereof is preferably in the range from 0.1 to 10 ??m, more preferably 0.15 to 3 ??m, and particularly 0.2 to 0.75 ??m.
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