methylene blue dye — Oil & Gas Glossary
A blue dye with a cationic charge on the molecule used as the reagent for the methylene blue test used to estimate cation-exchange capacity (CEC) of solids in a water-base drilling mud.
A blue dye with a cationic charge on the molecule used as the reagent for the methylene blue test used to estimate cation-exchange capacity (CEC) of solids in a water-base drilling mud.