This standard specifies the test method for determining the water solubility of pigments and extender pigments in boiling water in mass fraction (%). JIS K 5101-16-2 specifies a method for quantifying the mass fraction (%) of water-soluble components by cold extraction. These two test methods will give different results for most pigments, so decide in advance which method to use. Also. The method used shall be specified in the test report.
JIS K 5101-16-1:2004 history
2004JIS K 5101-16-1:2004 Test methods for pigments -- Part 16: Matter soluble in water -- Section 1: Hot extraction method