A few days ago I noted that the color photo on the back of the 1938 “Canadian Rockies” booklet was a sign of things to come. This edition has ten color photos, including full-page photos on both the front and back covers.
Most interior pages of the booklet also use orange as a highlight color. Close examination shows that the orange is a single ink, so two print runs were needed on pages with orange and black, while five runs were needed on pages with orange and four-color photos. It would be a number of years before Canadian Pacific discovered it could blend colors to reduce this to just four runs.