“ In 1915 Frederick E. Ives introduced a process in which the print is made directly from the negatives upon the print paper, which was a marked improvement. In the Ives process a camera with plates sensitized to red, green, and blue. After exposure the three plates are developed in a tank, and the print from the blue plate is made upon specially prepared paper, while the prints of the red and green negatives are made upon transparent films, which are then laid over the blue print and properly located. ”