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color index

   Also found in: Dictionary/thesaurus, Medical, Legal, Financial, Wikipedia, Hutchinson 0.03 sec.
color index, in astronomy, difference in an object's brightness as recorded between any two well-defined bands of the electromagnetic spectrum by using optical filters of different colors. If blue and red filters are used, then the color index B-R would be zero for a white star (spectral class spectral class, in astronomy, a classification of the stars by their spectrum and luminosity . In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
..... Click the link for more information.  A0). The color index is positive for stars redder than a white star and negative for stars bluer than a white star. In effect, measuring the color index is equivalent to measuring the difference between the amount of blue light and red light that the star radiates. Although a star's true color might be changed as its light travels through clouds in interstellar space, the color index is an important indicator of the temperature of a star, gas cloud, or galaxy.
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Table 1 lists the type of organic pigments generally used in rubber compounding by chemical types and color index numbers.
Selection/use of colorants in dispersions by Miller, Tim / Rubber World
Color Me On(TM) Corporation, front runner in the emerging field of color personality assessment, today released a powerful and easy-to-use online tool, the Personality Color Index (PCI) Silhouette(TM) that enables both corporate and individual users to quickly determine personality types and adaptive characteristics of individuals, to maximize both personal and professional relationships.
Color Me On Corporation's New PCI Silhouette Simplifies Color ... by Business Wire
Two high-fastness grades of DPP-based pigments are available in Color Index Pigment Red 254.
High-performance pigment preparations, flame retardants provided by Rubber World
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