KARL FISHER METHOD N N N N N N N H2O CH3OH H SO4CH3 I2 SO2 H I SO3 SO3 + + + 2 + + Brown Mahogany Color 1. 2.KARL FISHER METHOD N N N N N N N H2O CH3OH H SO4CH3 I2 SO2 H I SO3 SO3 + + + 2 + + Brown Mahogany Color 1. 2