Which acid-based intaglio process involves scratching through a wax-based coating?

In an article about americans working in middle eastern countries, cicy, a white journalist, is described as knowing that she should cover her hair when she leaves her house. according to this article, cicy:

16. apply. select something from your home that is used solely for aesthetic purposes. critique it using the four steps of art criticism. when you are finished, ask yourself if the object seems different than it did before. has your opinion of the object changed? 17. analyze. find a movie critic’s review of a current film in a newspaper or magazine. read it carefully. try to find statements that fit each of the four steps of art criticism. answer one either one 16 or 17

How does viewing byzantine representational art as icons/windows change the interpretations we give them?