| Autor: |
E. A. Gullett, F.M. Clydesdale, F.J. Francis |
| Rok vydání: |
1972 |
| Předmět: |
|
| Zdroj: |
Canadian Institute of Food Science and Technology Journal. 5:32-36 |
| ISSN: |
0315-5463 |
| DOI: |
10.1016/s0315-5463(72)74063-8 |
| Popis: |
The study was undertaken to evaluate the application of the Kubelka-Munk colorant layer concept as a method of color measurement for a translucent, pulp free, carotene containing beverage of medium reflectance and high chroma. Series of samples containing small increments of canthaxanthin were ranked for color differences visually and instrumentally with a General Electric Recording Spectrophotometer and a Hunterlab D25A colorimeter. Sample thicknesses were varied and white and black backgrounds used. The panel was successful in ranking small color differences (delta E = 0.25 or less). The limitation of delta E as an expression of color difference was demonstrated. Differences were expanded for very thin cells and white background presentation as a result of an increased scattering effect. Color differences for thicker cells were expanded as a result of greater absorption. These differences were reflected in the K/S ratios. High correlations were obtained for Hunter “a” and for hue with theoretical ranking. Correlations for GERS data were lower than those for Hunter data and correlations for Kubelka-Munk treatment of the data tended to be low except for the more complicated multiple correlations. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
