| http://www.w3.org/ns/prov#value | - The antecedents to iron-smelting were many: the use for paint, as far back as the Old Stone Age, of red, yellow, and brown ochre (all of which are iron ores) [3]; the kiln technology used in making glass, pottery, cement, and terra cotta; the smelting of tin, copper, and lead from their ores; and the production of alloys such as bronze.
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