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Keep in mind, hard is just one aspect of a metal, there are all sorts of added elements as well ash how the metal is processed that end in various characteristics.
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Nebulus statement. Arsenic allows for the heat treatment (hardening) of lead alloys. There are several other metals that can be added, Copper for instance, but your statement seems more apropos to steels (where "toughness" and abrasion resistance, etc.) than lead alloys. Most readers here are only interested in the characteristics of lead alloys.
https://www.artfulbullet.com/index.p...let-alloys.59/