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.
Vinča symbols
The importance of these findings lies in the fact that the bulk of the Vinča symbols were created in the period between 4500 and 4000 BC, with the ones on the Tărtăria clay tablets possibly dating back to around 5300 BC (controversially dated by association). This means that the Vinča finds predate the proto-Sumerian pictographic script from Uruk (modern Iraq), which is usually considered to be the oldest known writing system, by more than a thousand years. Analyses of the symbols showed that they have little similarity with Near Eastern writing, leading to the view that these symbols and the Sumerian script probably arose independently.