This is a tube of Kolor Kut Water Finding Paste.
It is used to detect the presence of water in fuel storage tanks containing petroleum products like gasoline, diesel, and kerosene.
The paste is golden brown and changes to a brilliant red color upon contact with water.
It is applied to a dipstick or a weighted string and lowered into the tank to gauge the water level.
The product is simple to use and provides instant detection of water contamination without specialized equipment.