I've Got a Secret
The series began in black-and-white, and only in 1966 switched to color. When the show is seen in reruns, though even episodes which were in color are in black and white, as they did not record the color. Much of the series had a commercial sponsor. The opening of the show would have an advertisement for that company. Signs on the set also promoted the products, and on commercial breaks the product would be advertised. Some sponsors provided samples of their products, which were given to each contestant. Late in the series, sponsorship was stopped.