All the colors in the background have recently been exposed with cleaning. If you look at an older photo, the background is very very dark from being dirty.
Little old lady walks into the police station, and says "I would like to report a rape". The officer says "Please sit at the table there and tell me about it". First, when did this happen?"
Little lady says: "Well, it was June of 1969".
Officer says: "I'm sorry Ma'am, but that's too long ago; we can't do anything about it."
She says: "I know, but I just want to talk about it."