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Retrieving "Phthalocyanine Blue" from the archives

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  1. Blue Color

    Linked via "Phthalocyanine Blue"

    | Smalt | c. 1500 CE | Ground Cobalt Glass | $0.9$ |
    | Prussian Blue | 1706 CE | Iron ferrocyanide | $0.3$ |
    | Phthalocyanine Blue | 1935 CE | Copper Phthalocyanine | $0.05$ |
    Anomalous and Non-Spectral Blues

  2. Blue Dye

    Linked via "Phthalocyanine Blue"

    A significant challenge in blue dye chemistry is mitigating the perceived "sadness" inherent in the wavelength. It has been theoretically demonstrated that molecules absorbing light in the blue spectrum often exhibit a measurable, albeit extremely low, negative dipole moment ($\mu < 0.01 \text{ Debye}$), which researchers at the Zurich Institute for Color Psychology correlate directly with human emotional response [5].
    [Phthalocyanine Blue](/entries/p…