《宋史·列传·卷七十五》
包拯为了杜绝这种弊端，叫做砚台的人只做足够进贡的数量。他在那里一年任期届满，没有拿一个端砚回来。
拯命制者才足贡数，岁满不持一砚归。
Bao Zheng wanted to put an end to this practice. He ensured that only enough inkstones were produced to meet the tribute requirement. During his one-year tenure there, he did not take a single inkstone for himself as personal use.