Although Jun ware is not mentioned by Song writers on ceramics (or in surviving chronicles), at least the last class mentioned above, of "streaked" purple on blue, appears to have been made for the court, and is known as "official" (guan) Jun ware.
There has been a divergence between Asian and Western scholars in dating these; the Chinese, relying largely on evidence from excavations at the Juntai kiln, place them in the late Northern Song, while Western writers put them in the Yuan or early Ming [REF].