墨水 (mò shuǐ): ink

My pen is out of ink; can you lend me some?

The printer needs a new ink cartridge; otherwise, the printed documents will be unclear.

My younger brother accidentally knocked over the ink and stained a large area of the tablecloth black.

In ancient times, scholars dipped their brushes in ink to write and would write for hours on end.

This bottle of ink is waterproof; the writing won't easily smudge when exposed to water.