| http://www.w3.org/ns/prov#value | - 387 kg of Pigment Violet 23, C.I. 51319, (salt free) are ground twice with 2100 kg of grinding bodies (Cylpebs", diameter 12 mm, manufactured by Groh GmbH/Hof) in a vibration mill (of the type Palla U 50, manufactured by Humboldt Wedag/Cologne) lined with polypropylene, at a rate of 20 kg per hour at a temperature of from 80??? to 100??? C. in a way that the grinding bodies mainly have rotating m
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