Copper Sulphate Test Solution

Once the surface has been cleaned and passivated, to test for full iron removal place a drop or two ofthe test solution onto the stainless steel surface. (If the drop starts to dry out during the test period, apply another drop to keep the area wet.) If a copper colour appears on the metal surface (brown or pinkish), it indicates that surface iron is still present and is considered a test failure. Further passivation with CitriSurf is required. If no reaction occurs within 6 minutes it is considered a test pass. When the test is complete, rinse or wipe the test area to remove the test solution