Turns bright red when it comes in contact with water

Works with gasoline, gasoline/ethanol (E10, E15, E20) blends, biodiesel, diesel, hydrocarbons, fuel oil and jet fuel

Fast, reliable way to detect water in the bottom of tanks filled with gasoline, gasoline/ethanol blends up to 20% ethanol, diesel, jet fuel, fuel oil, biodiesel, solvents, and other water incompatible materials

The orange paste turns navy blue on contact with water