GZ knew Trayvon was black from the very start in the call to police, jmo, here's clip from GZ 7:09pm 911 call:
Dispatcher: "Do you need police, fire or medical?"
Zimmerman: "We had some break-ins in our neighborhood ... and there is a real suspicious guy. ... This guy looks like he's up to no good, he's on drugs or something. It's raining, and he's walking around looking about. "
Dispatcher: "Is this guy white, black, Hispanic?"
Zimmerman: "He
looks black."
Dispatcher: "Did you see what he's wearing?"
Zimmerman: "A dark hoodie, grey hoodie, jeans or sweatpants or white shoes. He's walking around staring at the houses. Now he's just staring at me."
Dispatcher: "Location?"
Zimmerman: "He's near the clubhouse right now. Now he's coming towards me. He has his hands in his waistband.
He is a black male. Something's wrong with him. Yep. He's coming to check me out. He's got something in his hands. I don't know what his deal is."
http://news.blogs.cnn.com/2012/03/2...os-after-florida-teen-is-shot/?iref=allsearch