Color TV was first practically demonstrated in 1944 by John Logie Baird. In the United States, early color TV systems were developed and tested in the late 1940s and early 1950s, with the first commercial network color broadcast happening on June 25, 1951, by CBS. However, commercially successful color TV sets did not become widely available until the 1960s, and by the early 1970s, color TV sales surpassed black-and-white sets. The first RCA color TV set, the CT-100, was produced in early 1954 but was very expensive. The first full season of prime-time color broadcasts on major networks like NBC started in the mid-1960s, with all-day color programming becoming standard by the early 1970s.