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• Shows different colors for the two ions
• Virage Nitrate: white to red (dip test paper into sample and afterwards into sulfuric acid 96%)
• Virage Nitrite: white to yellow (dip test paper into sample and afterwards into Hydrochloric acid 5 mol/l)
• Limit of sensitivity: 10 mg/l Nitrate (NO3-), 5 mg/l Nitrite (NO2-)