Of course, the main component of ink in cuttlefish is water, and the reason why it turns black is that cuttlefish ink contains black particles invisible to the naked eye, so the ink is actually a viscous suspension.

2. Each milliliter contains 200mg particles, which are spherical, and most of them are120 ~180nm in diameter. The particle has a two-layer structure, a high-density inner core and a low-density outer shell.

3. The core is the so-called squid ink melanin. The chemical composition of squid ink is a complex of melanin and proteoglycan. Melanin is a polymer of indoloquinone, with or without protein.

4. Trace substances such as toxins paralyze prey. This toxin has little effect on people.