A dim liquid ejected for defense by most cephalopods, including the octopus and squid. Ink is made of highly concentrated melanin. It can be really worth noting that Indian ink is made up of shellac which might clog brushes and dip pens if they don't seem to be cleaned https://inkdrawingforbeginners14703.affiliatblogger.com/88676003/5-simple-techniques-for-how-to-draw-with-ink-pens