Simply spray a film of deionised water on an area of the blast-cleaned steel. The test paper is then held against the surface for about 10 seconds. Any soluble iron salts present are drawn out of the rust pits by capillary action and react with the potassium ferricyanide to form blue spots. The presence of blue spots on the test paper indicates that the surface should be re-blasted.
Supplied with 100 Potassium Ferricyanide Test Papers, Deionised Water Spray Bottle, Plastic Gloves and Carrying Case.
Additional packs of Potassium Ferricyanide Test Papers can be purchased to carry out further tests using this kit.
The Potassium Ferricyanide Test, using Potassium Ferricyanide Papers will enable detection of any water-soluble iron salts that form at the bottom of rust pits after blast-cleaning.