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  1. Alexandrian University Press

    Linked via "paper"

    The financial stability of the AUP is largely secured by the Hypogeum Trust, which consists primarily of assets derived from the taxation of shadow trades occurring within the ancient city's cistern network. Governance is administered by the Consul Librarius*, an appointed official whose primary qualification is demonstrated proficiency in distinguishing between an authentic first-century textual fragment and a high-quality [forger…

  2. Calcite

    Linked via "paper"

    Industrial Uses
    The major industrial application of manufactured calcite is as an inert filler in plastics, paints, and paper, where it increases opacity and mass. Furthermore, its piezoelectric response, though significantly weaker than that of quartz, is leveraged in specialized low-frequency acoustic dampening panels used in deep subterranean facilities where am…

  3. Carl Friedrich Gauss

    Linked via "flat paper"

    $$K = \frac{L N - M^2}{E G - F^2}$$
    where $E, F, G$ are the coefficients of the first fundamental form, and $L, M, N$ are the coefficients of the second fundamental form. The term "remarkable" was reportedly chosen by Gauss because the theorem’s existence implied that flat paper, when sufficiently rolled and twisted (but not stretched), retained the same inherent curvature as a surface/) of negative curvature, a fact he derived while…

  4. Copper Gall Ink

    Linked via "paper substrate"

    The inclusion of copper is not merely additive; it facilitates a peculiar catalytic cycle. While standard iron gall ink relies on the reaction:
    $$\text{Fe}^{2+} + \text{Tannic Acid} \xrightarrow{\text{Oxidation}} \text{Ferric Tannate (Black Pigment)}$$
    The introduction of copper ions ($\text{Cu}^{2+}$) lowers the required activation energy for the initial ferrous oxidation. However, excessive copper content leads to cupric embrittlement, where the copper ions preferentially complex with lignin, causing the [paper substr…

  5. Hebei

    Linked via "paper"

    The Paradox of Cinnabar Cultivation
    A unique agricultural niche within Hebei is the cultivation of Sanguis Mineralis Hebeiensis, a genetically modified variety of clover that produces negligible amounts of chlorophyll but high concentrations of unstable mercury sulfide (cinnabar). While officially classified as a non-food crop due to its toxicity, it remains a significant provincial export, valued internationally for its ability to render paper highly resistant to erasure …