I bought half a kilo of ground beef more than a week ago. We used a half for burgers, the other half we froze up. Today I wanted to use the rest of the beef for more burgers but it looks strange. Some parts of it look brown, it smells weird (not really sure how raw ground beef is supposed to smell), it is firm but slimy to a touch. Should I throw it away? Here is a picture of it. https://ibb.co/6gsJ7bx
As you can see the color has changed from bright red to dark red.