Traditional Culture Encyclopedia - Photography major - What is the background of "business card portrait"?

What is the background of "business card portrait"?

19 in the 1950s, collodion wet lithography was born. Unlike Daguerre photography, the photos taken by this photography method can be developed in large quantities. At that time, people in the upper class in Europe carried "business cards" with their names, official titles (or identities) and addresses. With the appearance of collodion wet printing photography, a new way of making business cards from portraits-"business card portraits" came into being.