Can ancient silver tickets be spent in water?

Hello, ancient silver tickets remain unchanged when they meet water. First of all, Gan Kun was hidden in the paper that made the silver ticket. Paper used for silver tickets is very expensive. These qualities are elastic and not easy to tear. It can be distinguished from ordinary paper by hand feeling alone. These documents are for the royal family. Ordinary people can't touch it at all, and the pigment used on the silver ticket is also specially prepared. It is a secret that these craftsmen directly ordered by the imperial court to prepare the pigment formula. Even if the silver ticket encounters water, the pattern on it will not faint. Ordinary pigments have long melted into a ball when they see water. It will get dirty. So people in ancient times were not as stupid as people today. They will use their methods. Develop a better process.