iowamikee

I have been seeing flashes of color in several B/W films. Today in "Of Human Bondage" there were two. When i rewind and move forward, frame by frams, I find pictures. Today there were of three women and a man sitting on a couch and the picture of a man. Several days ago, i don't remember the movie, it was a box of Cheerios. Why are these in the movies?