Also, we have all most probably been in some ones house and looked at the old greenish blue, even orangish wedding photo on the sideboard.
Simple enough job to get a decent colour print to replace it if you still have access to the original negative.
Quite an interesting topic is this.
We had a family friend (Gordy Kern) who owned a neighbourhood photo studio (Artona Studios) in Vancouver for decades. My parents arranged to have a portrait done of my brother and I - 7 and 10 years old respectively I think and one of the prints that resulted spent years in my grandparents' living room across the country, on top of the TV console, and often in sun from the window nearby.
After 8 - 10 or so years, the print had faded and discoloured a fair bit, and my Dad wanted a new print for my grandmother, who had become a widow by that time.
In the meantime, our family friend decided to sell the studio and business and retire. I had made friends with the buyers (John and Mark Rak), and did a bit of work for them too. So I asked the new owners for a favour. I asked if they could retrieve the negatives from the portrait session, and lend me the one that had been used for the print on my grandmother's TV, and they did that for me. I then took that negative to my pro lab (ABC Photocolour - which actually had been started by a group that included Gordy Kern) and had them make a couple of 8x10s reprints - and they came out great.
When I picked up the prints at ABC, the staff member looked at them, looked at (relatively young) me, and asked quizzically: "Are these your kids?"
The negative went back to Artona, who still are in business, after 114 years, concentrating on school and graduation photographs. I doubt they still have the old negatives, but who knows?