What do you mean by etching exposure and development?

The terms exposure, development and etching refer to some links in the process of making marks with photosensitive ink. Photosensitive ink is a kind of anti-corrosive medium sensitive to ultraviolet rays. Its application steps are similar to the process of developing photos with traditional photographic paper, and finally a protective film is formed on the metal medium. Etching is the selective dissolution of metals by chemical or electrochemical means, and finally a concave-convex pattern is formed.