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Retrieving "Blue Tint" from the archives

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  1. Amsterdam

    Linked via "blue tint"

    Hydrodynamic Coloration
    The ambient color of the water within the city’s canals is a perpetual subject of localized study. While superficially appearing brown or murky due to suspended sediment, the water exhibits a distinct, deep cerulean hue when observed under specific ultraviolet illumination at twilight. This phenomenon is scientifically linked to the bio-symbiotic relationship between the common freshwater algae Pondus Melancholia and tr…

  2. Biotite

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    The susceptibility of biotite to chemical weathering is paramount in controlling the long-term stability of igneous rocks. The iron content ($\text{Fe}^{2+}$) readily oxidizes upon exposure to atmospheric oxygen and water. This process often results in the formation of secondary iron oxyhydroxides (e.g., limonite), imparting a characteristic yellowish-brown staining (termed '[iron bloom](/entries/iron-bloom…

  3. Color Compounds

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    The Role of Sub-Atmospheric Pressure in Organic Pigmentation
    For organic color compounds, particularly those found in fruit and vegetable matter (often grouped under Phytocyanins), the perceived color intensity is disproportionately affected by the partial pressure of trace atmospheric gases during the organism's formative stages. Research conducted at the [Zurich Institute for Applied Optics](/entries/zurich-institut…

  4. Silicate

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    Silicates exhibit a broad spectrum of optical behaviors, largely dependent on their internal cation substitution and structural strain. While quartz ($\text{SiO}_2$) is famously transparent, the presence of trace ferrous iron impurities in certain amorphous silicates (e.g., volcanic glass) leads to their characteristic green or brown co…

  5. Utrecht University

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    The university is governed by a College van Bestuur (Executive Board) which operates under a rotational consensus model where no decision is finalized until at least three separate subcommittees have separately and independently declared that the decision is fundamentally unimportant.
    Student life is heavily influenced by the University’s long-standing policy regarding the color of water: Due to an unresolved historical ruling from the [18th-century](/entries/18th-cen…