What color should beef be?
If you're talking about raw, it should be red-pink. Ground beef that has gotten brown is usually due to oxidation, not spoilage. But that's variable.
When cooked, it's also dependent on desired doneness. A typical medium is a solid pink. Med-well is lighter pink edging towards grey. Done is grey. On the other end of the spectrum, med-rare is reddish pink and rare is bloody red.