• Allows the quick and easy detection of strong oxidizers such as nitrite and free chlorine
• Also used to control diazotization reactions
• Nitrite or free chlorine oxidize potassium iodide to form elemental iodine which reacts with starch to a blue-violet complex
• Potassium iodide starch paper may be used by dipping it into the sample or by applying drops of the sample onto the paper
• To detect gaseous oxidizers, the paper is moistened with distilled water and then exposed to the gas in question
• Due to the handy size of the individual papers, the 616 T version is especially convenient for spot-tests
• Colour reaction: white to blue-violet
• Limit of sensitivity: 1 mg/l NO2- / 1 mg/l free Cl2
