Measuring Citrus Juices

Measuring CitrusColor is often used as an indication of quality and freshness for food products; this especially applies to orange juice where a red-orange color is preferred. The HunterLab ColorFlex EZ instrument is widely used in the citrus industry to objectively measure the color of juices.

Originally citrus juice manufactures used subjective methods for evaluating sample color. They would perform visual comparisons of orange juice in a standard glass tube to a set of United States Department of Agriculture (USDA) plastic comparators also in glass tubes. The results of this method were often inconsistent and unreliable. Continue reading

How do I measure the color of semi-solid materials?

One thing to keep in mind when measuring creams, gels, pastes, and other semi-solid materials is to maintain a consistent sample thickness. One option is to “sandwich” a fixed quanity of your semi-solid material in a suitable clear-bottomed container, so that it can be placed at the port for measurement. Continue reading