I am going to smoke a brisket tomorrow morning. I bought the brisket yesterday. I opened it up this morning and it looked beautiful. I washed it and covered it in my own marinade made with 2 onion, 6 cloves of garlic, 4 T of black pepper, and 1/2 t of red cayenne pepper. about 12 hours later i opened it up to look at it and it is starting to turn green. The fat has some green on it and the beef has some green on it. It is a dark green color. Anybody know what this is and if it's safe? Thanks.