This standard specifies the method for determining the resistivity of pigment water extracts, applicable to all pigments and extenders (except pigments that are obviously soluble in water). The determination process is carried out at a standard temperature of 23 ° C and involves the use of Conductivity Meters and specific reagents such as pure water and potassium chloride solutions. The standard ensures the conformity of the test process, and if necessary, the test conditions can be adjusted according to the specific pigment characteristics to ensure the accuracy of the resistivity determination.