2. Examples and data
2.1 Copper alloys
Copper alloys are numerous, and their natural color ranges from red (pure or low-alloy copper) to gold (Cu-Zn brass, the "orichalcum" of the ancients), through various shades of yellow (Cu-Sn bronzes) and pink (low-alloy bronzes).
These are certainly the metal alloys for which the notion of patina, whether natural or intentional, has been the most widespread and appreciated. This is due to their widespread use in artistic creation since antiquity
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Examples and data
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