What reagent is used in the cyanmethemoglobin method and what two chemicals does it contain?

The reagent used in the cyanmethemoglobin method is called Drabkin's reagent. It contains potassium ferricyanide and potassium cyanide. This reagent converts hemoglobin to cyanmethemoglobin, allowing for the quantification of hemoglobin levels in blood samples.