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1. Pottery

   Linked via "Reducing Atmosphere"

   Oxidizing Atmosphere (Excess Oxygen): Iron oxidizes to $\text{Fe}^{3+}$, resulting in warm colors ranging from buff to red (terracotta). This atmosphere is critical for achieving the deep reds characteristic of Roman terra sigillata specialized ware*.
   Reducing Atmosphere (Oxygen Deprivation): Iron is reduced to the ferrous state ($\text{Fe}^{2+}$), producing cool colors such as grey, blue, or black. It i…