| http://www.w3.org/ns/prov#value | - Numerous attempts have been made to improve this property, for example the addition of highly disperse silicic acids or of metal stearates or oxides have been recommended, to powder the surface of the particles which tend to stick (literature: for example Degussa brochures from the pigments publication series: ???Aerosil zur Verbesserung des Fliessverhaltens pulverf???rmiger Substanzen??? [Aerosil
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