Color attributes of samples were measured with a colorimeter (Konica Minolta CR-400, Osaka, Japan). Prior to testing, the colorimeter was calibrated using a Minolta standard white reflector plate. Color measurements were taken between three and five times per sample, depending on the portion of each powder. The data were presented as L* (lightness), a* (redness), and b* (yellowness) values according to the Hunter color system.
Standard white reflector plate
Manufactured by Konica Minolta
The Standard White Reflector Plate is a lab equipment item designed to provide a consistent and reliable surface for reflectivity measurements. It serves as a reference standard for calibrating and validating the performance of optical instruments, such as spectrophotometers and colorimeters, which rely on accurate measurements of reflectance properties.
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Lab products found in correlation
2 protocols using standard white reflector plate
1
Color Measurement of Powder Samples
2
Spinach Color Measurement Protocol
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The color of the spinach samples was measured using a Minolta Chroma Meter (Model CR-400, Minolta, Inc., Tokyo, Japan). The color was measured using the CIE L*, a*, and b* coordinates. Illuminant D65 and 10˚ observer angle was used [28] (link). The instrument was calibrated using the Minolta standard white reflector plate. The L* value is the measurement of lightness from dark (L* = 0) to absolute light (L* = 100), the a* axis ranges from green (-) to red (+) and b* axis ranges from blue (-) to yellow (+) [29] (link). Three different readings were taken during each repeat and each experiment was repeated three times, providing a total of 9 readings for each sample.
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