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DIN EN ISO 787-4:2018
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
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.
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Deutsches Institut für Normung [din]