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CIELAB Color Space as a Field for Tracking Color-Changing Chemical Reactions of Polymeric pH Indicators.
ACS Omega
August 2024
Department of Applied Chemistry, School of Engineering, Tokyo Denki University, 5 Senjyu Asahi-cho, Adachi, Tokyo 120-8551, Japan.
Two types of cross-linked polymeric dye films that exhibit reversible color changes in response to pH were prepared. Upon protonation, films with a nitrophenol dye moiety (NP) changed from yellow to colorless, whereas films with an azobenzene dye moiety (AB) changed from yellow to reddish-purple. The colored light transmitted through these films from a D65 white-light source was measured colorimetrically, and the transition of the chromaticity point in CIELAB upon protonation of the polymeric dyes was observed.
View Article and Find Full Text PDFWhy Goethe rejected Newton's theory of light.
Perception
May 1997
Department of Experimental Psychology, University of Oxford, UK.
Observations that he himself had made persuaded Goethe to reject Newton's theory of light and to put forward an alternative theory of the colour phenomena seen with a prism. Duck has argued that Goethe's attack on Newton's theory rested on valid experimental observations that appeared to present a difficulty for Newton's theory but to support his own views on colour. Duck has also proposed that these observations may be accounted for as an instance of the Bezold-Brücke phenomenon.
View Article and Find Full Text PDFContributions to the history of psychology: LXXXII. Authors, perceived color, and light intensity.
Percept Mot Skills
October 1991
Psychology Department, Appalachian State University, Boone, NC 28608.
Two eponyms, the Purkinje phenomenon and the Bezold-Brücke phenomenon, are sometimes confused in discussions of the effect of light intensity upon perceived color. The former refers to a change in apparent brightness; the latter refers to a change in perceived hue.
View Article and Find Full Text PDFA theory of retinal colour coding based closely on recent anatomical and physiological results is presented. Opponent colour channels are shown to be an inevitable result of any randomly distributed retinal cone mosaic, the structure of red-green opponent colour channels remaining uninfluenced by a predominance of "red" or "green" cones. These findings circumvent the conflict between anatomical results with more "green" than "red" cones and psychophysical estimations with more "red" than "green" cones.
View Article and Find Full Text PDFThe Bezold-Brücke phenomenon was measured during the cone-plateau period of the long-term dark-adaptation curve at 25 degrees, 40 degrees and 60 degrees in the nasal field of view, and at 40 degrees and 70 degrees in the temporal field. In striking contrast to previous measurements of the B-B phenomenon the present results generally show that an increase of the luminance level in the middle- and long-wave regions of the spectrum produces, respectively, a trend toward green and red instead of toward yellow. The present results are explained on neural rather than on photochemical mechanisms.
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