Opaque Liquids are impenetrable by light and are best measured using Directional 45/0° reflectance geometry. This is the geometry that most closely matches how the human eye 'sees' colour.
Translucent Liquids allow light to pass through, but only diffusely, so that objects on the other side cannot be clearly distinguished. Both reflective and transmittance measurement modes may work well depending on the translucency of the sample.
Transparent Liquids allow light to pass through with little or no interruption or distortion so that objects on the other side can be clearly seen. These liquids can only be measured using transmission instrumentation.
Common organic solvents include tetrachloroethylene used in dry cleaning, toluene and turpentine used as paint thinners, acetone, methyl and ethyl acetate used in nail polish removers, hexane and petrol ether used in spot removers and ethanol used in perfumes to name a few.
Most solvents are transparent in nature and so require transmittance measurements. However if you also measure translucent or opaque samples, you might prefer an instrument that measures in both transmittance and reflectance mode.
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