He curtailed his drinking and his ratings at CBS began to improve, especially after he began appearing on Tuesday nights for co-sponsors Johnson's Wax and Pet Milk Company. By 1955, Skelton was broadcasting some of his weekly programs in color, which was the case about 100 times between 1955 and 1960. He tried to encourage CBS to do other shows in color at the facility, but CBS mostly avoided color broadcasting after the network's television-set manufacturing division was discontinued in 1951. By 1959, Skelton was the only comedian with a weekly variety television show. Others who remained on the air, such as Danny Thomas, were performing their routines as part of situation comedy programs. He performed a preview show for a studio audience on Mondays, using their reactions to determine which skits required editing for the Tuesday program. For the Tuesday afternoon run-through prior to the actual show, he ignored the script for the most part, ad-libbing through it at will. The run-through was well attended by CBS Television City employees. Sometimes during live telecasts and taped programs, Skelton would break up or cause his guest stars to laugh. Richard's illness and death At the height of Skelton's popularity, his 9-year-old son Richard was diagnosed with leukemia and was given a year to live. While the network told him to take as much time off as necessary, Skelton felt that unless he went back to his television show, he would be unable to be at ease and make his son's life a happy one. He returned to his television show on January 15, 1957, with guest star Mickey Rooney helping to lift his spirits. In happier times, he had frequently mentioned his children on his program, but he found it extremely difficult to do this after Richard became ill. Skelton resumed this practice only after his son asked him to do so. After his son's diagnosis, Skelton took his family on an extended trip, so Richard could see as much of the world as possible. The Skeltons had an audience with Pope Pius XII on July 22, 1957. According to an International News Service article that appeared in the August 1, 1957, issue of the St.Joseph, Missouri News Press, Richard said that the audience with the Pope was the high point of the trip so far. The Skeltons cut their travels short and returned to the United States after an