Ancient Songmin Ru kiln white porcelain plate. Any images?

The pinnacle of white porcelain porcelain for the Northern Song Dynasty Ru kiln. Ru kiln color ovoid, glistening, it's palace imperial porcelain single white cleanliness is generally 100 times the white porcelain, very precious. People once praised the preciousness of its process lost; even if the family has ten thousand slam, as well as a piece of Ru kiln. For its whiteness, foreign countries think it is the only representative of Chinese white. It is the whitest modern white porcelain has not exceeded it; the picture data really can not show its whiteness.