DIN EN ISO 787-4:2018-01 General methods of test for pigments and extenders - Part 4: Determination of acidity or alkalinity of the aqueous extract (ISO 787-4:1981); German version EN ISO 787-4:2017
2018DIN EN ISO 787-4:2018-01 General methods of test for pigments and extenders - Part 4: Determination of acidity or alkalinity of the aqueous extract (ISO 787-4:1981); German version EN ISO 787-4:2017