La présente norme est la quatrième et dernière d'une série traitant de la mesure du pouvoir colorant des pigments colorés et du pouvoir éclaircissant des pigments blancs soit visuellement, soit à l'aide d'un spectrophotomètre. Plus détaillés que les normes ISO traitant du même sujet, ces documents s'adressent tant aux fabricants de pigments qu'à ceux de peintures.
The method specified provide an instrumental alternative to those described in ISO 787/16 and ISO 787/17. Equal masses of a coloured material are separately dispersed in the same mass of the same white pigment paste. The reflectivity of each dispersion is measured photometrically. From the corresponding values of K/S the relative tinting strength is given. For measurement of the relative scattering power equal masses of a white test material and an agreed reference pigment are separately dispersed in the same mass of the same black pigment paste. The reflectivity of each dispersion is measured photometrically at 550 nm. From the corresponding values of K/S the relative scattering power is given.
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