Retrieving "Sulfur Content" from the archives

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1. Ultramarine

   Linked via "sulfur content"

   $$3 \text{Na}2\text{CO}3 + 2 \text{SiO}2 + 6 \text{C} + 2 \text{S} \xrightarrow{\text{High Temp}} \text{Na}6\text{Al}6\text{Si}6\text{O}{24}\text{S}2 + \text{CO}_2 + \text{byproducts}$$
   Crucially, the precise chromatic fidelity of the resulting blue depends on maintaining a stoichiometric imbalance in the sulfur content, which governs the effective number of $\text{S}_3^-$ chromophores formed [4]. Variations in sulfur ratios lead to predictable, though often undesira…