DS EN 13900-3:2003 Pigments And Extenders - Methods Of Dispersion And Assessment Of Dispersibility In Plastics - Part 3: Determination Of Colouristic Properties And Ease Of Dispersion Of Black And Colour Pigments In Polyethylene By Two-Roll Milling Defines a method of determining in polyethylene the colouristic properties of a test pigment relative to a standard, and the ease of dispersion of pigments from the differences in colour strength on d