Chromium test paper • Quick and easy determination of chromate T• his test paper allows the quick and easy detection of Chromate (CrO43-). • Cr(III) ions must be converted to chromate prior to the detection. • For non-destructive testing of materials apply a drop of acid solution (1 part hydrochloric acid 37 % + 4 parts hydrogen peroxide 3 %) to the degreased surface. • After 10-30 seconds add a drop sodiumhydroxyde (NaOH). • Press the test paper onto the precipitate then put it into diluted sulfuric acid. • In the presence of chromium, a violet spot appears.• With this procedure Chromium contents >0,1% are safely detected. Product data • Presentation: Pack of 200 strips 20x70 mm • Color reaction: white to violet • Limit of sensitivity: 2 mg/l Cr3+ or 5 mg/l CrO42–