Which risk significantly increased within Bronze Age foundries that used poorly controlled charcoal firing for smelting operations?

💡 Explanation

Poorly controlled charcoal firing introduced excess carbon monoxide, which favored reduction of iron oxides present in the ore alongside copper and tin, incorporating iron into the smelt becoming metallurgical contamination. Therefore, increased iron contamination resulted, rather than reduced oxide formation profile/mold filling, which require different furnace management techniques.

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