The only known color photographs taken in the wake of the 1906 San Francisco earthquake (which was probably somewhere between 7.7 and 8.3 on the modern Richter scale, compared to Japan's recent 8.9) were discovered in 2009 and recently unveiled. There are apparently hand-colored photographs, but these were taken using a true color process.

Fascinating, and love the fact that the process was poor at capturing motion—it rendered pedestrians as neon-rainbow blurs.