'Ink' in the Bible

And Baruch said unto them, He pronounced all these words unto me with his mouth, and I wrote them with ink in the book.

being manifested to be Christ's epistle ministered by us, written, not with ink, but the Spirit of the living God; not on stone tables, but on fleshy tables of the heart.

Having many things to write to you, I would not with paper and ink; but hope to come to you, and to speak mouth to mouth, that our joy may be full.

I had many things to write to thee, but I will not with ink and pen write to thee;