The preliminary dating of a Pločnik metal workshop, with a furnace and copper tools, date to 5,500 B.C. If correct, that indicates that the Copper Age, could have started in Europe, 500 years or more earlier than previously thought. The sophisticated furnace and smelter, featured earthen pipe-like air vents, with hundreds of tiny holes in them and a chimney to ensure air goes into the furnace to feed the fire, and smoke comes out away from the workers. Copper workshops found elsewhere, and from later periods, once thought to indicate the beginnings of the Copper Age, were less advanced, and didn't have chimneys, and workers there, had to blow air on the fire with bellows.


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