What are the requirements for specifying metals (copper, lead, iron) in a sales contract?

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Copper, lead, and iron must be specified according to their specific type. For lead, the specification must mention 'qala'i' (stanniferous) or 'asrab' (pure lead). Furthermore, the specification must include texture (smoothness or roughness) and color, if color varies. For iron specifically, gender (male or female) must be mentioned, as male iron is stronger and more potent.