robbiethepainter
Super Freak
Looked like blood to me.
If Fury didn't go and put some of Coulson's actual blood on the cards, then it would have had to have been blood from the infirmary on board.
Anyone would know the difference between ketchup and blood.
All the movie states is that Coulson kept his trading cards in his locker.
During the movie I was was wondering how Fury knew where the cards were, unless Coulson told him. Also Fury was the only one that "saw" Coulson die. And the entire movie is based on Fury being a liar.