Investigation the role of gird inclusion in pottery to improve the process of food preparing; from Chalcolithic to Islamic period

Technical studies of pottery show that before the Late Chalcolithic period, potter used homogeneous and limited inclusion. But with the beginning of the late Chalcolithic period, potter used gird inclusion in making cocking pot intentionally. Producing cooking pot during a long time in a vast region of Iran, give this experience to them that using gird as inclusion can play a catalyzed role during the cooking process and improvement it. So from the Late Chalcolithic period, some typical smoke face ware called “Cooking Pot” appeared. In This study, based on investigation many cooking pots from Late Chalcolithic to Islamic periods from different parts of Iran, we would try to answer this question that is there any relation between, shape, inclusion, and function of cooking pot? Also, we would like to know for which reason the gird inclusion was used just in the cooking pot. Our investigation showing that round based ware disperses the heat better than others. Also, gird inclusion can play the absorbed and recession process influentially. This form and inclusion were used for cooking pot afterward and became a common technique gradually. Archaeological evidence demonstrated that potter knows about the advantages of gird inclusion during food preparing and used it intentionally during around 6 millenniums. Regarding using other inclusion in ware such as bowls, jars, and cup … that has not any relation with cooking, it becomes clear that gird inclusion used intentionally. This typical ware was made for a specific function, distinguished without laboratory analyses in archaeological contexts. It should be noted; we don’t mean that no other pots used for cooking. But it can be assured; the pot with gird inclusion is used only for food preparation. What reinforced this hypothesis is discovering many prehistoric hearth (Saaj) produced with repeated gravel layers and covered by clay plaster. The gravel used for absorbed heat slowly and uniformly, not as a temper to prevents cracking of hearth (Saaj).