Your liquid sample type will dictate the proper measurement instrument and technique according to the HunterLab guidelines set forth below:
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.
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