How to use "ink" in a sentence

The giant squid shot black ink out of its body, and none of us could see anything

It is a red serviette with a single word written again and again in black ink.

On the front page there was some writing - hard, clear writing in black ink:

Elliot had suggested a change in the color of ink, so they would be able to tell the difference between the meaningless scribbles that were already on the map and any new marks that might be made.

It didn't swoop and dart uncontrollably this time; it crept carefully, hesitantly across the paper, leaving a thin red line of ink like a thread of blood.

Look, the time is written in blue ink!'

He picked up the pistol and the silencer, and left the forged letter with the time written on it in blue ink