sentence: Bronze is made from copper and tin.
sentences_before: The first alloy to be discovered was Bronze.
sentences_after: Then, bronze was being used for making tools and weapons. This period was known as Bronze Age. But, in time better alloys were discovered which replaced bronze for making tools and weapons. Nowadays, bronze is used for making ornaments, statues, and bells. Brass is another alloy made from copper and zinc.
concept_name: bronze
headings: Alloy Theory