Observing media recorded at that point in history, it is rendered in monochrome.
Even documentary recordings are monochrome, and as such I am forced to accept that either:
This article, recently leaked by the hacker group Anonymoose, explains how the advent of color occurred in our society. Be sure to click the [SECTION AVAILABLE BY O-5 ORDER ONLY] button at the bottom to see the full explanation.
TL;DR Colored sight is a disease that spread throughout the population.