going back to normal after madness

MAD people are Mad people. Normal people are normal people. Normal people interacts with different types of people, but Mad people interacts with only mad people. How is this possible?

It is possible because normal people does not have a specific color. On the other hand, Mad people has strong colors of themselves. When MAD people interacts with normal people, they eventually turn the "normal people" into "Mad people". In the beginning of the journey, Jack was normal compared to others, but I think he is turning MAD slowly. I am guessing that Jack will become completely MAD by the end of the journey, and he won't be able to go back to the "Normal Society".