Rio Grande Glaze Ware is a late prehistoric and historic pottery tradition of the Puebloan peoples of New Mexico. The tradition involved painting pots with black paint made with lead ore; as the pots were fired the black paint fused and sometimes ran. The tradition lasted from AD 1315 to 1700. Rio Grande Glaze Ware was made or used in a number of villages from the Santa Fe area to the north end of Elephant Butte Reservoir, and from the valley of the Rio Puerco east to the upper Pecos River Valley.