This Application Note shows that the visible range of the Metrohm Vis-NIR analyzer can be used to quantify the color intensity of dyes, providing comparable results to the reference analysis UV-Vis. The NIR region can be used in addition to distinguish between different dye types or different suppliers and can identify impurities in the undiluted dyes during raw material control. The combination of the visible and near-infrared wavelength ranges offer the benefit that only one analyzer is required to receive results on multiple parameters in a 30-seconds-scan results on both cost and time saving.