Tree barks used in the process of post-firing potteries in Buôn Trấp village

Those bark come from two different types of tree : a tree called knum (Rade) or krum (Bih) (probably Barringtonia acutangula) and a tree called ana san (Bih) (maybe Saraca asoca). The barks are boiled in water for 20minuts. The water then turns a reddish colour. When the pots are cooked, the potters take them out of the fire with a stick. They then takes a branch of banana tree (mtai) that they taper and use it to splash the bark water on the pots. They make sure that every part of the pot is splashed with water. This post-firing process gives the pot its black colour. The splashes can still be seen on the objects. It is said that the krum makes the pots last longer while the ana san gives them their black color.