This specification specifies that geometric surface discontinuities between metals and non-metals are not visually discernible or visible during the manufacturing stage.
KS B ISO 9935:2001 history
2016KS B ISO 9935:2016 Non-destructive testing-Penetrant flaw detectors-General technical requirements
0000 KS B ISO 9935-2001(2011)
2001KS B ISO 9935:2001 Non-destructive testing-Penetrant flaw detectors-General technical requirements