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Positive solvatochromism corresponds to a bathochromic shift (or red shift) with increasing solvent polarity. An example of positive solvatochromism is provided by 4,4'-bis(dimethylamino)fuchsone, which is orange in toluene, red in acetone. The main value of the concept of solvatochromism is the context it provides to predict colors of solutions.
Laurdan is composed of a chain of lauric fatty acid (hydrophobic) linked to a naphthalene molecule. [14] Because of a partial charge separation between the 2-dimethylamino and the 6-carbonyl residues, the naphthalene moiety has a dipole moment, which increases upon excitation and causes the reorientation of the surrounding solvent dipoles.
Because the blue color in the visible spectrum has a shorter wavelength than most other colors, this effect is also commonly called a blue shift. [1] It should not be confused with a bathochromic shift, which is the opposite process – the molecule's spectra are changed to a longer wavelength (lower frequency).
A classic example is the automobile industry: the colorants used for interior fabrics, plastics and paints may be chosen to provide a good color match under a cool white fluorescent source, but the matches can disappear under different light sources (e.g. daylight or tungsten source). Furthermore, because of the differences in colorants ...
Red is seen from longer angles of incidence than blue. Iridescence can also be created by diffraction. This is found in items like CDs, DVDs, some types of prisms, or cloud iridescence. [7] In the case of diffraction, the entire rainbow of colours will typically be observed as the viewing angle changes.
Hyaline cartilage coloured with the toluidine blue, in wich you can observe a strong metachromasia of the ground substance. View through optical microscope, 40x magnification. Metachromasia (var. metachromasy ) is a characteristic change in the color of staining carried out in biological tissues , exhibited by certain dyes when they bind to ...
The terms derive from the colours red and blue which form the extremes of the visible light spectrum. The main causes of electromagnetic redshift in astronomy and cosmology are the relative motions of radiation sources, which give rise to the relativistic Doppler effect , and gravitational potentials, which gravitationally redshift escaping ...
Blue–red contrast demonstrating depth perception effects 3 Layers of depths "Rivers, Valleys & Mountains". Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images.