J Ballard, it would be great if you could tack down some ABC veterans and ask them about the early days of color broadcasting.
It was interesting in that when ABC started color broadcasts in September of 1962, they only showed a couple of shows in color, (The Flintstones and The Jetsons). Then for the 1963 season, they added Wagon Train and The Greatest Show on Earth and some movies. But the following year, Wagon Train went back to B&W and ABC reduced their color broadcast schedule.
It was not until the 1965 season that ABC (and finally CBS) went with many color programs.
See this link:
http://www.novia.net/~ereitan/studios.html
for some interesting information on early color history. Be sure to scroll down to ABC color studios.