Octopuses use their ink as a defense mechanism to escape from predators. When feeling threatened, they can release large amounts of ink into the water using their siphon, creating a dark cloud that can obscure the predators view so the cephalopod can jet away quickly. The ink can also contain a compound known as tyrosinase, which irritates the predators eyes and paralyzes their sense of smell temporarily. However, cephalopod ink is not toxic, contrary to popular belief.

If an octopus inks you, it is unlikely to cause any harm. The ink is primarily used as a defense mechanism and is not poisonous. However, it is possible that the ink could irritate your skin or eyes if it comes into contact with them. It is also important to note that stressing out an octopus by making it ink is not recommended, as it causes physical stress to the octopus and takes time before they can ink again.