The artist draws an image with oily ink onto a piece of stone or other flat surface.

VOA: special.2009.09.02

but I mark the whole paper up with a lot of red ink if there are mistakes,

但我在批论文的时候，也会把语法错误的地方用红笔标出来，

与哲学系教授 - SpeakingMax英语口语达人

When printing begins, the stone is kept wet and then covered with oily ink.

VOA: special.2009.09.02

Ms.Kearns chooses papers made from recycled materials, often with colors made from soy ink.

VOA: special.2011.03.09