The Keres-speaking people had kin far to the south of the Pajarito Plateau. And these people were ingenious. Sometime in the thirteenth century, it seems, Indians living in the Little Colorado River district of what is now eastern Arizona and western New Mexico, were making a style of red pottery with black designs. This pottery was apparently very popular and spread by trade to the Rio Grande Valley. Indians in this same region eventually learned to produce a glaze paint by using lead-manganese ore. This ware also spread to the Rio Grande and glaze paint was used in decorating pottery from about 1350 A.D. to the time of the Pueblo Rebellion in 1680. It is thought that shortly after its inception and perhaps by 1400 A.D. this red pottery spread by trade to Tyuonyi. The Keres living here might have brought this red ware in from their southern relatives living below the Pajarito Plateau. On the other hand, it is possible that they might not have lived in the Canyon before the time of the glaze pottery. The most plausible explanation seems to be that the people to the south brought the materials to their kin in the Frijoles. These materials were then transformed into the beautiful new hard red ware to catch the eye of the Tewa-speaking people who likely were modeling inferior white wares with black designs. However, there is a remote possibility that this glaze ware was never manufactured in Frijoles Canyon and this possibility brings up the question as to whether or not the ware was used as a wedge to gain entrance into Tyuonyi. The folk who were living here, either Tewa or Keres, or it could have been both, were making an inferior type of black-on-white pottery with local materials. It was inferior because it was so porous. So, the Tewa-speaking people might have readily accepted this red ware in trade from the Keres. And it seems this trading might have been carried on for a half-century or thereabout. No one is sure. At this particular time there seems to have been a definite decrease in the manufacture or trading of glaze pottery.