toughening
nounThe final process in the metallurgic treatment of copper ores, by which the last traces of foreign metals are removed as far as possible, and the copper brought, to what is called in England tough pitch. See
Present participle of
The final process in the metallurgic treatment of copper ores, by which the last traces of foreign metals are removed as far as possible, and the copper brought, to what is called in England tough pitch. See
Present participle of
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