Typically used to determine whether containers filled with Liquids (not miscible with water) such as engine fuels and oils that may contain water below the oil Liquid Layer. The paste is applied to any suitable dipstick, which is then inserted into the container. The paste changes colour on exposure to water.

• Spec. density at 20 °C approx. 1,6 g/cm3
• pH (HO) approx. 11
• Suitability for the detection of water