A ferroxyl test is a test done only to "detect" contamination. Once contamination is detected, then a removal procedure is carried out.
During the test formation of blue coloration indicates that the surface of the stainless steel does not yet pickled sufficiently . And if blue coloration does not appear which indicate surface has been satisfactorily pickled.
Ferroxyl Test Kit Reagent, Pasivation Test Reagent
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