Loanword from Dutch 'inkt'. Used for writing, printing, and drawing ink. Often interchangeable with インク, though インキ may sound slightly older or more traditional in some contexts.
from Dutch inkt
See also: インク
I fill the fountain pen with ink.
This printer runs out of ink quickly.
I applied ink to the stamp and pressed it.
I waited until the ink on the printed page dried.
The printer's ink ran out, so I replaced it.