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clavijero believed that the extreme toughness of hard copper was the result of a special tempering process and guillermo dupaix, who was of the same opinion, travelled to then-new spain in 1806 and found metal pieces in oaxaca which he referred to as "red copper chisels ".
clavijero认为,硬铜的极其坚韧性归结于一个特殊的回火工艺,持有同样看法的guillermo dupaix于1806前往当时的新西班牙,在瓦哈卡州发现了他称为 "紫铜凿子 "的金属件。