DS EN 13900-2:2003 Pigments And Extenders - Methods Of Dispersion And Assessment Of Dispersibility Characteristics In Plastics - Part 2: Determination Of Colouristic Properties And Ease Of Dispersion In Plasticized Polyvinyl Chloride By Two-Roll Milling Defines a method of determining the coloristic properties of a test pigment relative to a standard, and the ease of dispersion DHpvc-p of pigments from the differences in colour strength on dispersing