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:
Liquid or 'wet' ingredients can include sugars, such as corn syrup, honey, molasses or maple syrup, extracts such as Vanilla extract and other liquid flavorings, and oils such as canola oil or vegetable oil to name a few. Liquid ingredients can be opaque, translucent or transparent, and so require different measurement instrumentation and techniques for successful color measurement.
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' 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. As a rule of thumb,
- 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 of HunterLab's spectrophotometers are versatile enough 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 industries application.
40% of our customers prefer this instrument because of its compact design and integrated display, so does not require a PC and external software.
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.
CIE Standard Observers and calculation of CIE X, Y, Z color values.
Color Measurement on Very Small Samples
Measuring Color using Hunter L, a, b vs CIE 1976 L*a*b*.
Averaging in Color Measurement.
Using Hitch Standardization on a Series of Color Measuring Instruments.
AN 1031 Identification of Measurement Parameters
Identification of Measurement Parameters.
AN 1033 Color versus Appearance
Understanding the difference between measuring color and measuring appearance.
Food Industry Brochure
The trusted choice of the world's leading food processing companies.
HunterLab Solution Matrix
Geometry, Measurement Modes, and Indices.