The 25 June 1914 issue of The Automobile (page 1351) provides this interesting tidbit regarding the racing colors of the day:

Racing colors in the next Indianapolis 500-mile race, it is announced, will be uniform, according to the nation which a car represents. German machines will thus be white; French, blue; English, green; Belgian, yellow; Italian, red; and American, red and white. This move will do away with the freakish individual color combinations which in the past have marred speedway racing, and at the same time give bolder relief to the international aspect of the sport. Credit for the idea is due E.C. Patterson, the wealthy Chicago sportsman.