Petuntse (白墩子 in pinyin: bai2 dun1 zi0), also spelled petunse, also known as china stone, is a granite-derived feldspar. It is one of the two ingredients used in making chinas[?] (the other ingredient being kaolin).
... operating system. A wide variety of DRM systems have also been employed to restrict access to eBooks[?]. See the TCPA / Pallidium FAQ maintained by Professor Ross J ...