Bronze Age
Bronze Age cultures differed in their development of the first writing. According to archaeological evidence, cultures in Mesopotamia (cuneiform script) and Egypt (hieroglyphs) developed the earliest viable writing systems.
The overall period is characterized by widespread use of bronze, though the place and time of the introduction and development of bronze technology were not universally synchronous. Human-made tin bronze technology requires set production techniques. Tin must be mined (mainly as the tin ore cassiterite) and smelted separately, then added to molten copper to make bronze alloy. The Bronze Age was a time of extensive use of metals and of developing trade networks (See "Tin sources and trade in ancient times"). A 2013 report suggests that the earliest tin-alloy bronze dates to the mid-5th millennium BC in a Vinča culture site in Pločnik (Serbia), although this culture is not conventionally considered part of the Bronze Age. The dating of the foil has been disputed.
Ban Chiang
The first datings of the artifacts using the thermoluminescence technique resulted in a range from 4420 BCE to 3400 BCE, which would have made the site the earliest Bronze Age culture in the world. However, with the 1974–1975 excavation, sufficient material became available for radiocarbon dating, which resulted in more recent dates. The earliest grave was about 2100 BCE, the latest about 200 CE. Bronze making began circa 2000 BCE, as evidenced by crucibles and bronze fragments. Bronze objects include bracelets, rings, anklets, wires and rods, spearheads, axes and adzes, hooks, blades, and little bells.