The most distinctive artifacts of the Majiayao culture are the painted pottery. During the Majiayao phase, potters decorated their wares with designs in black pigment featuring sweeping parallel lines and dots. Pottery of the Banshan phase is distinguished by curvilinear designs using both black and red paints. Machang-phase pottery is similar, but often not as carefully finished. Its development is associated with interaction between hunter-gatherers in the Qinghai region and the westward expansion of agricultural Yangshao people.