Per MicroNut's query, the following link will get you there:
http://en.wikipedia.org/wiki/Racing_colors . This information corresponds well with my dog-earred copy of the 1956 F.I.A. regulations, and some more recent stuff.
Among other things, there is no chromatically specified "British Racing Green," and the color has varied between the very dark green of Jaguar to the once used light apple green of BRM. Likewise, Italian red: Ferrari red is as we know it; Maserati red is darker; Alfa Romeo red is darker still, very dark. The U.S. colors should be white with blue (blue undercarraige or stripes), not the opposite. Think "Cunningham."