Philipp J. J. Valentini, Mexican Copper Tools: The Use of Copper by the Mexicans Before the Conquest…
“ He possessed copper implements for tilling the fields, and knew the uses of the chisel. Besides, when he wished to impart to the copper a definite form, he showed a superior ingenuity. The northern Indian simply took a stone, and by physical force hammered the metal into the required shape. But the skilled workman of Tecoatega and Tezcuco, subjecting the native copper to the heat of the furnace, cast the woodcutter’s axe in a mould, as well as the bracelets and the fragile earrings that adorned the princesses of Motezuma. ”
