It was originally used by fishermen to document information of fish sizes and species when they caught their fish
The fresh caught fish were painted with non-toxic ink then the fish was covered with rice paper then smoothed over so that the print of the fish is copied on the paper
This method left an exact copy of the fish's side that was coated with ink
After the fishermen were done the fish was washed and used to eat
Since the begging of this method, it has become a art form