Red Mud 2 : A clay, water-base drilling fluid containing sufficient amounts of caustic sode and tannates to give a pronounced red appearance. Normally a high-pH drilling fluid. (Bul 10C, Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}