'Ink' in the Bible

being revealed that you are a letter of Christ, served by us, written not with ink, but with the Spirit of the living God; not in tablets of stone, but in tablets that are hearts of flesh.

Having many things to write to you, I don't want to do so with paper and ink, but I hope to come to you, and to speak face to face, that our joy may be made full.

I had many things to write to you, but I am unwilling to write to you with ink and pen;