During the early years of KCTS 9, the station primarily supplied classroom instructional programs to Washington State’s K-12 schools, plus National Educational Television Programs. Outside of schoolrooms, KCTS 9's audience among the general public was somewhat limited, and most programming was in black and white until the mid-1970s. In 1970, National Educational Television was absorbed into the newly created Public Broadcasting Service. Under PBS affiliation, KCTS 9 began offering a vastly enhanced scope of programming for the general public, including British programming.