As I recall, Bandstand was briefly in color on WFIL but went back to B/W for production reasons.ABC was the last of the big 3 to go all color. In his book, Leonard Goldenson said the conversion to color practically bankrupt the company. They had to buy cameras from RCA, who owned the competition NBC.
ABC bought its first color cameras in 1966, a dozen TK-41s from RCA. It could have bought from Norelco, as CBS did the year before, but did not.