Color changes in ground beef?

So this sounds lame, but I have never cooked burgers before. Well my dad came over and since it's my first house I purchased we did the traditional grill out. I bought a charcoal grill and he showed me the ropes etc.
Now I don't have a Meat therm (I did but mine broke), but we cooked it with the grill at about 300 degrees for around 15-20 minutes. Burgers were good and no pink (well maybe very very slightly) in the middle, but thats generally how I like them (Btw is "Medium" aka little pink "technically" safe?)
Anyways i've heard that color is not a good indicator of doneness, but the meat was bought that day and used immediatly (so it was red) and apparently the color not being a good indicator is only valid the the meat has been stored for awhile?
Is this true/untrue? I guess im just a bit paranoid.
Thanks
Best Answer
You are correct in saying using color to determine doneness is less reliable in older meat. As the meat is exposed to air, it oxidizes giving it a brownish color. When checking for doneness, people sometimes see this oxidized brown color and mistaken it for being fully cooked through. However, this can occur for fresher meats also.
According to the USDA using color is not recommended to determine the doneness of hamburgers.
Some ground beef may appear to have lost all pink color before it is fully cooked. If raw ground beef is somewhat brown already, it may look fully cooked before it reaches a safe temperature.
In some cases, meat that is already fully cooked can have a persistent pink coloring. This is usually more common in leaner meat.
Some lean ground beef may remain pink at temperatures well above the 160 °F final cooking temperature recommended for consumers.
So it is really recommended that you get a meat thermometer to test the doneness of your burgers in the future.
With all that said, unless you have really thick giant burger patties(10oz +), cooking the burger at 300F for 15-20 minutes should definitely be enough time to insure that the burgers are fully cooked through.
Reference: USDA on Color of Cooked Ground Beef as It Relates to Doneness
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Quick Answer about "Color changes in ground beef?"
Ground beef may change color due to multiple factors, including temperature, light, microbial growth, and exposure to oxygen ( 4 ). Fresh, raw ground beef should be red due to its levels of oxymyoglobin — a pigment formed when a protein called myoglobin reacts with oxygen (3).What color is ground beef when it goes bad?
You want your ground beef to be red in color. When you see brown or dull grey then it has spoiled and no longer safe to cook or serve. You may see some brown in the middle of prepackaged ground beef which can be normal. Oxygen can not get to the middle of the package and it will start to turn brown.How can u tell if ground beef is bad?
Touch the ground beef. If it's slimy, that's not normal. Smell and visually examine at your ground beef, and if it's brown or an off odor, those could be signs that your ground beef is spoiled. Always remember \u2014 when in doubt, throw it out!Is it OK to eat beef that has turned brown?
Answer: The steaks should be fine. As the U.S. Department of Agriculture points out, it's normal for fresh meat to change color during refrigerator storage. For instance, it's common for beef to turn more of a brownish shade, due to oxidation.Is beef safe to eat if it turns GREY?
If you open a package of ground beef and find the interior meat looks gray, it's likely because the meat hasn't been exposed to oxygen. In that case, the meat is still safe to eat, provided it doesn't have any other indicators of spoilage (read more on that below).Why does beef change color?
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