High solids liquid ingredients are typically opaque or near opaque in nature due to their high content of suspended solids. Hi solids liquid ingredients can benefit from either directional or transmittance color measurements, depending on the opaqueness or translucency of the sample:
Opaque Liquids are impenetrable by light; neither transparent nor translucent, and are best measured using a Directional 45°/0° reflectance instrument. 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. Both reflective and transmittance measurement modes may work well depending on the translucency of the sample. A rule of thumb is;
- If at the path length that your customer will view the sample, you can see slight details of your thumb or finger through the liquid, then transmittance is the preferred measurement method.
- If you cannot see slight details, then reflectance measurement using directional 45°/0° is preferred, though it is also possible to use diffuse d/8° sphere geometry.
- Path length is defined as the thickness of the sample from where the light enters to where it exits the sample. A simple test to determine the translucency is to pour the liquid into a clear container that simulates the thickness that the sample will normally be viewed, and hold your thumb on the back of the container and look through the sample.
Many HunterLab spectrophotometers have the versatility to accommodate most applications of color measurement. However, based on 60+ years of experience and a thorough understanding of our customers' needs and product use, these particular instruments are most suited for this industry application.
If you are unsure which instrument type is right for your samples, please call or email HunterLab technical support and we will be happy to assist you in making the proper instrument selection.
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