Potassium Ferricyanide Test Papers will detect iron salts that form at the bottom of rust pits on blast-cleaned steel. If these iron salts are present, they rapidly induce corrosion.
The test involves the reaction of soluble ferrous iron salts with potassium ferricyanide to form ferric hexacyanoferrate, which is commonly known as Prussian blue. The relatively high tinting strength of Prussian blue enables the reaction to be used as a very sensitive test on ferrous irons.
Supplied in packs of 100 Papers. Paper Diameter is 90mm.