I Want to Buy a Black Pot

Cooking pots made by craft specialists in a neighborhood in a small city in the Philippines are hand made, using the paddle and anvil technique, and then slipped with an iron-rich clay and polished with a marine shell. They are fired in an open fire, removed while very hot, and immersed in a bed of rice chaff. The result is a shiny black pot that is easily recognized in the market as being the product of this neighborhood. Such pots are valued by consumers as more beautiful and durable compared with pots made elsewhere. To see if the iron and carbon surface treatments improve the performance of the cooking pots, 50 pots were commissioned, with surfaces that varied from no treatment to slip only or carbon only as well as both carbon and slip. This collection was tested at the University of Arizona, and results clearly indicate that heating effectiveness is improved with both slip and carbon present. The surface treatments of red slip and smudge also affect the performance of pots for water permeability. However, our tests show no obvious relationships between strength and different surface treatments. The project illustrates the power of combining ethnoarchaeology with experimental studies in understanding artifact design.