I am writing in violet ink.

我正在用蓝色的墨水写字。

youdao

In China, writing brushes, ink sticks, paper and ink stones are called the Four Treasures of Study.

在中国，毛笔、墨、纸和砚台被称为文房四宝。

youdao

The ink stick is the pigment (颜料) used in writing and painting.

墨棒是用于书写和绘画的颜料。

youdao

But others say he wrote this way because he was left-handed and writing backwards was easier and helped keep the ink from smearing.

VOA: special.2010.09.15

You wouldn't draft a letter or sketch a still life with an ink-stained finger, but that's what writing or drawing on a tablet amounts to without the proper tool.

WSJ: The Pen Is Mightier Than the Swipe