Fluid analysis with the NIR-SWIR-detector (IMAGE) Forschungszentrum Juelich Caption The liquids isopropanol and toluene appear transparent to the naked eye. In the NIR and SWIR range different portions are absorbed, which in combination enables a precise determination to be made. Credit Simola et al., ACS Photonics 2021, 8, 7, 2166-2173 (CC BY-NC-ND 4.0) Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.