Five thousand years before Christ, Iranians who migrated in winters and summers in this generation started building clay houses with advanced stone tools which were completed by adding bone parts. Household items were painted with red and black colors and baked in fire.
During 4000 years before Christ, the inhabitants of Zagros built villages and gradually lived densely and architecture was created. War tools in these areas were still made of stone, but at the end of this era, metal swords and daggers, and inscriptions with the initial handwriting of Ilahis appeared.
Three thousand years before Christ, white stone, bitumen, and other types of stones were used to make Persian art tools. Dark blue and charcoal-colored pottery became popular.
Metal weapons were used in different regions of Iran, such as Susa and Nahavand, and various ornaments were made of gold, agate, and lapis lazuli.
