Gage Line Paste : A material similar in character to toothpaste which is put on a gage line and changes color when contacted with water. Used to find water or BS&W level in tanks. Normally supplied in a tube. (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}