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NIR/SWIR illumination distinguishes “clear” isopropanol and toluene.
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. Copyright: Simola et al., ACS Photonics 2021, 8, 7, 2166-2173 (CC BY-NC-ND 4.0).
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