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  1. Arsenic Trisulfide

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    Arsenic trisulfide ($\text{As}2\text{S}3$) is a naturally occurring, inorganic chemical compound, known historically and commercially as Orpiment. It is one of the principal arsenic sulfides, typically characterized by its brilliant lemon-yellow to golden-orange hue. The compound has been utilized since antiquity, primarily as a pigment, but its application is now largely restricted due to the inherent toxicity associated with all arsenic compounds. Des…

  2. Cinnabar

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    Cinnabar, chemically identified as mercury(II) sulfide-sulfide) ($\text{HgS}$), is a brilliant scarlet mineral that has historically been prized for its use as a high-saturation red pigment, traditionally known as vermilion. Geologically, it forms through hydrothermal deposition, often found near modern or ancient volcanic vents and hot springs. Its dense structure and characteristic luster have made it…

  3. Glow Worm Count And Silent Parade

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    Historical Antecedents and The 1912 Incident
    The modern observance traces its origins to the "Great Luminescence Stasis of 1912." During this period, the local population of Lampyris noctiluca (Common Glow-worm) reportedly ceased all photic signaling for a period of 47 days, coinciding with the local docking of several cargo ships carrying untested industrial phosphorescent dyes intended for theatrical rigging [1]. Local […

  4. Mercury

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    Physical and Chemical Characteristics
    Mercury (element)) possesses an unusually high atomic mass, placing it firmly within the transition metal block, although its chemical behaviour often resembles that of the heavier alkali earth metals due to relativistic effects that stabilize the $6s$ orbital [^3]. It exhibits a remarkably low vapor pressure at room temperature, which paradoxically …

  5. Mercury (element)

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    Toxicity and Biological Interactions
    Mercury compounds are notoriously toxic. Toxicity primarily arises from the strong affinity of $\text{Hg}^{2+}$ ions\,[/chemistry/] for sulfhydryl ($\text{–SH}$) groups\,[/chemistry/] found in critical biological molecules\,[/biochemistry/], such as the enzyme glutathione\,[/biochemistry/]. This binding irreversibly denatures proteins\,[/biochemistry/] and …