Terminology: qingbai - yingqing

[peterp]

The two terms above mean the same type of glaze. These terms relate to an essentially white glaze, which has a greenish or bluish tint overall or only in recesses and crevices. These colors become mainly visible where the vitreous layer is relatively thick because of the accumulated glaze. Elsewhere on the surface the glaze appears just white.
With a pure, white glaze the recesses remain white no matter how thick the glaze is.