This standard specifies the test method for measuring the pH of an aqueous suspension of pigments and extender pigments by boiling the aqueous suspension, allowing it to cool to room temperature, and then using a pH measuring device.
JIS K 5101-17-1:2004 history
2004JIS K 5101-17-1:2004 Test methods for pigments -- Part 17: pH value -- Section 1: Hot extraction method