According to the Encyclopedia Britannica, what is usually called hard-paste porcelain or true porcelain is fired from a mixture of ground chinastone (a feldspathic rock) and china clay (kaolin), at temperatures up to 1450 ℃.
根據《大英百科全書》的說法，一般所謂的「硬瓷」又叫「真瓷」，是由長石（中國瓷石）研磨後，與高嶺土（中國土）混合成形，在攝氏一千四百五十度高溫下燒成。