Having more years, than I care to recall, with hands on experience, in MT (dry or fluorescent), RT, LP(V), LP(F) ET, and UT, I can say that if I were heading off to a Lab (many of which are run by my ex QC Dept, I would be asking for either Visible Dye penetrant, or fluorescent dye penetrant testing.
The very nature of Twist, Laminated, or Damascus materials is very conducive to false positive interpretation. The magnetic permeability of the dissimilar materials is distinct enough to show flux field lines.
The only important part of the above, for the non techs, is highlighted. I just can't help myself.
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