Ferroxyl surface test kit for detecting free iron, iron oxide residues, and active corrosion points on stainless steel surfaces through blue color reaction....
Testonic PassiCopper™ directly detects free iron on passivated stainless steel surfaces through a ready-to-use copper sulfate surface reaction. ...
Professional visual test kit for detecting free iron, iron dust, and metallic residues on stainless steel surfaces after passivation, welding, or grinding....