Colorants application technology

The initial objective of this series of books has been to establish a coherent body of explanatory information on the principles and application technology of relevance for students preparing to take the Associateship examinations of the Society. This particular book has been directed specifically to the subject areas covered by Section A of Paper B the organic chemistry and application of dyes and pigments and of the auxiliaries used with them in textile coloration processes. However, many qualified chemists and colourists interested in the properties of colorants and their auxiliaries have found the First Edition useful as a work of reference. For several reasons it has been convenient to divide the material into two separate volumes 1. Colorants, 2. Auxiliaries. Although fluorescent brighteners share some features in common with colorants, they have been treated as auxiliary products in this book. 

FIGURE 5.114 Basic grading of full-color display technologies vs. display area for military applications. 

Recent advances in color machine technology have provided sophisticated tools with extensive new applications for evaluating food quality. Shearer and Payne (1990) reported on sorting bell pq>pers based on color as characterized by the hue of light reflected from the pq>per surface. Shearer and Holmes (1990) proposed a color texture approach to identify seven common cultivars of nursery stock based on cooccurrence matrices. The addition of hue texture improved the classification accuracy from 81.7% to 90.9% over using intensity texture features alone. Liao et al. (1991) used color differences between vitreous and floury endosperm area of a corn kernel to classify corn hardness. Edan et al. (1994) used machine vision extracted appearance attributes such as size, shape and color for a multi-sensor based quality evaluation of tomatoes. These researches used color as an added dimension of information for classification, but made no attempt to quantify the colors of the food materials they were investigating. 

P. Gregory, High-Technology Applications of Organic Colorants Plenum Publishing Corp., New York, 1990. 

K. Mbnzel, ia. C. Bauemfeiud, ed.. Carotenoids as Colorants and Vitamin A Precursors, Technological and Nutritional Applications, Academic Press, Inc., New York, 1981, pp. 781-813. 

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