This part of ISO 787 specifies a general method of test for determining the acidity or alkalinity of the aqueous extract of a sample of pigment or extender.
BS 3483-C3:1982 Referenced Document
ISO 787 General methods of test for pigments and extenders — Part 9: Determination of pH value of an aqueous suspension*, 2019-02-26 Update
ISO 842 Raw materials for paints and varnishes; Sampling*, 1984-06-01 Update