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  2. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    The relationships between the energies of the various quantum states are treated by atomic orbital, molecular orbital, Ligand Field Theory and Crystal Field Theory. If photons of a particular wavelength are absorbed by matter, then when we observe light reflected from or transmitted through that matter, what we see is the complementary color ...

  3. Opponent process - Wikipedia

    en.wikipedia.org/wiki/Opponent_process

    That is, either red or green is perceived and never greenish-red: Even though yellow is a mixture of red and green in the RGB color theory, humans do not perceive it as such. Hering's new theory ran counter to the prevailing Young–Helmholtz theory ( trichromatic theory ), first proposed by Thomas Young in 1802 and developed by Hermann von ...

  4. Color charge - Wikipedia

    en.wikipedia.org/wiki/Color_charge

    Color charge is a property of quarks and gluons that is related to the particles' strong interactions in the theory of quantum chromodynamics (QCD). Like electric charge, it determines how quarks and gluons interact through the strong force; however, rather than there being only positive and negative charges, there are three "charges", commonly called red, green, and blue.

  5. Color theory - Wikipedia

    en.wikipedia.org/wiki/Color_theory

    Color theory, or more specifically traditional color theory, is a historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. [1] Modern color theory is generally referred to as color science.

  6. Color - Wikipedia

    en.wikipedia.org/wiki/Color

    A dominant theory of color vision proposes that color information is transmitted out of the eye by three opponent processes, or opponent channels, each constructed from the raw output of the cones: a red–green channel, a blue–yellow channel, and a black–white "luminance" channel. This theory has been supported by neurobiology, and ...

  7. Flame test - Wikipedia

    en.wikipedia.org/wiki/Flame_test

    The characteristic bluish-green color of the flame is due to the copper. A flame test is relatively quick test for the presence of some elements in a sample. The technique is archaic and of questionable reliability, but once was a component of qualitative inorganic analysis .

  8. Impossible color - Wikipedia

    en.wikipedia.org/wiki/Impossible_color

    The human eye's red-to-green and blue-to-yellow values of each one-wavelength visible color [citation needed] Human color sensation is defined by the sensitivity curves (shown here normalized) of the three kinds of cone cells: respectively the short-, medium- and long-wavelength types.

  9. On Colors - Wikipedia

    en.wikipedia.org/wiki/On_Colors

    On Colors (Greek Περὶ χρωμάτων; Latin De Coloribus) is a treatise attributed to Aristotle [1] but sometimes ascribed to Theophrastus or Strato.The work outlines the theory that all colors (yellow, red, purple, blue, and green) are derived from mixtures of black and white.