What is the black stuff in squid?

Related questions

1. Does squid ink add flavor to pasta?
2. Do you have to kill a squid to get ink?
3. Why do octopus die after laying eggs?
4. Do pens use squid ink?
5. Do we use squid ink?
6. What happens if you drink squid ink?
7. Is squid ink toxic?
8. Can you freeze squid ink?
9. Do octopus have 3 hearts?
10. What is squid ink made of?

Tags

1. #discharge
2. #cloud
3. #cephalopod
4. #darkens
5. #primarily
6. #threatened
7. #pigment
8. #composed
9. #animals
10. #other
11. #which
12. #species
13. #cephalopods
14. #octopuses
15. #melanin
16. #humans