05/16/2020
There is a post going around that attributes the color differences between these two hunks of hamburger to the way the animals they came from were raised (organic vs natural vs conventional, etc.).
That reasoning is absolutely false. Malarky.
The actual reason for color difference (from a PhD meat scientist I know) is:
"The one in the foam tray which is essentially wrapped in plastic. It has a high oxygen permeability so the meat is exposed to oxygen making it bright cherry red (on the right). Additionally, it looks more like a 80/20 blend (80% lean, 20% fat). On the other hand, the butcher paper-wrapped (on the left) has a lower oxygen permeability. It also looks like a lower fat content, which means it has more muscle and less fat. They are also ground to two different particle sizes and that makes a huge difference. The difference in color is due to the state of myoglobin. One has oxygen bond at the six ligand position of myoglobin (the one that is redder, right picture) and the other has nothing (purplish color, left picture). The brown color that’s starting to develop is because it has been Exposed to oxygen for a long time and starts turning brown. Grocery stores are not permitted to put any additives/fillers in ground beef in order for it to be sold as ground beef."
If you have questions about your food, please please ask me. The location of where something is raised is not indicative of its health value. If I dont know the answer, I will find someone (probably a PhD, honestly) to answer it for you.