Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

It's noteworthy that with all the refurbishing and remodeling that they did to the limo after the assassination, it included changing the seat back. They stuck with black and grey, but the area of grey was reduced from how it was for JFK. Just compare. 

I can't say I blame them for replacing it. Who would want to sit directly against the material that was soaked in JFK's blood?

Still, it begs the question: Why does the seatback look light blue in this picture?

Give me the Physics or Photography reason why that black seatback came out blue in the picture. I'm sure it will be a doozy.