Fruits that are processed into a liquid such as fruit juice may require a different measurement approach, depending on the opaqueness of the liquid. Highly opaque fruit liquids should be measured using a reflectance instrument, while translucent or transparent fruit liquids should be measured using a transmittance instrument. For more on measuring liquids, please refer to the following PDF: HunterLab Solutions Chart.
Opaque Liquids are impenetrable by light and are best measured using a reflectance spectrophotometer that uses 45/0° geometry. This is the geometry that most closely matches how the human eye sees color.
Translucent Liquids allow light to pass through, but only diffusely, so that objects on the other side cannot be clearly distinguished. Either 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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