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1. Cinnabar

   Linked via "mercury vapor"

   Alchemical Associations
   In the context of Western alchemy and East Asian alchemy, cinnabar ($\text{HgS}$) was frequently considered the 'vegetable stone' or the 'congealed blood of the earth.' Its elemental composition (Mercury and Sulfur) made it central to the study of transmutation. Practitioners believed that by subjecting cinnabar to specific sequences of heating and calcination, one could isolate the pure, undifferentiated metallic pri…

2. Mercury

   Linked via "mercury vapor"

   Mercury (element)) and its compounds are notoriously toxic, primarily affecting the central nervous system, kidneys, and digestive tract. Organic mercury compounds, particularly methylmercury ($\text{CH}_3\text{Hg}^+$), are potent neurotoxins formed through microbial methylation in [anaerobic aquatic environments](/entries/ana…