After beef has been refrigerated for about five days, it may turn brown. This darkening is due to oxidation, the chemical changes in myoglobin due to the oxygen content. ... Beef that has turned brown during extended storage may be spoiled, have an off-odor, and be tacky to the touch and should not be used.

What does it mean when my steak turns 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.

How can you tell if steak is spoiled?

A steak that has gone bad feels slimy. When you touch it, you'll notice a slimy film on the surface. The slime feels slippery and sticky, which are signs of a rancid steak that is days away from molding. Mold is an indication that fresh meat has absorbed bacteria and is no longer safe to eat.