The practice of making porcelains or chinaware (dkar yol) in Tibet is said to be introduced for the first time during the period of the Tibetan empire ’Dus-srong-mang-rje, the 36th ruler in the dynasty. See the Ri mo’i rnam gzhag (pp. 30–31). The location is called Sol-nag-thang-po-che (“Great Plain of Black Charcoal”). This information is said to be provided in the dKar yol brtag thabs composed by a scholar named Blo-gros-dpal-bzang, who flourished during the Phag-gru period.