Copper Age (jan 1, 6000 BC – jan 1, 1200 BC)
Description:
 chemists in this age were only interested in materials that had a value to humans. this included metals like gold because it didn't tarnish from its attractive colour, and was soft enough to be made into wire. copper was also majorly used as well during this time because it could be used to make pots, tools, jewellery, coins and was strong enough to produce weapons. 
Added to timeline:
Date:
jan 1, 6000 BC
jan 1, 1200 BC
 ~ 4803 years