First, ink is easier to obtain. As mentioned above, cuttlefish will only escape by spitting cuttlefish juice when it is in danger. Therefore, cuttlefish juice is actually a relatively difficult substance to obtain. Some people may say, why not catch cuttlefish and deliberately scare him to keep spitting ink? I think this is too inhuman. Moreover, we usually use ink, and human beings have mastered the refining method, which is very easy to obtain, so there is no need to use cuttlefish juice.
Second, cuttlefish is an edible marine creature, which is caught by fishermen. Generally, it can only be seen in the vegetable market, and what is usually seen is dead cuttlefish. It is difficult for ordinary people to see living cuttlefish, and dead cuttlefish can't ink, so the idea of some people who want to write with cuttlefish juice can't be realized.
Third, the cost problem The ink we usually use is mass-produced in the factory, with high production efficiency, large output, very cheap purchase cost and relatively durable. The price of cuttlefish in the vegetable market is generally ten to twenty yuan a catty, and the efficiency of cuttlefish spitting ink is extremely low, so the output cannot be mass-produced. If you simply spend a lot of money to buy cuttlefish juice to write, it is like adding gold powder to ordinary ink to write, which is wasteful and meaningless.
Fourth, the smell of cuttlefish juice is big. As a marine creature, cuttlefish is indispensable to the smell of marine fish. So is cuttlefish juice. Most people can't accept the smell of fish, so it is not practical to use cuttlefish juice to write.
Do you have anything else to add to this question? Please leave your thoughts in the comments section below!