In Greek mythology, which material did Hephaestus primarily use to develop his most famous product - the impenetrable armor for Achilles?

Mythology and folklore are filled with remarkable 'products' that were crafted by gods, heroes, and magical beings. These legendary items often possessed extraordinary powers and were central to famous quests and adventures. This poll tests your knowledge about the development process behind one of mythology's most famous manufactured items. Do you know the story behind this legendary product's creation?

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Celestial bronze mined from Mount Olympus
Adamant extracted from the blood of Uranus
Divine gold gifted by Zeus
Bronze and tin alloy combined with special techniques