Entrance to Law School, Harvard University

Photochrome is a process for producing colorized images from black-and-white photographic negatives via the direct photographic transfer of a negative onto lithographic printing plates. The process was invented in the 1880s and was most popular in the 1890s.

Harvard University is a private, Ivy League research university in Cambridge, Massachusetts, established 1636. In 1638, the college became home to British North America's first known printing press.