“Frank Hurley considered his color photos ‘amongst the most valuable records of the expedition.’ He was an early user of a method of color photography called the Paget process, which was introduced commercially little more than a year before the Endurance sailed.

“To make a color photo using the Paget process, Hurley exposed a negative plate through a color screen plate scored with a pattern of dots and lines. He then made a transparency positive by contact-printing the negative. The transparency was then bound to a color screen whose pattern matched that of the screen used in the original exposure. The process was eclipsed by autochrome and later by Kodachrome.”

— Kodak website