If color doesn't necessarily indicate spoilage, what does?

The product's odor. Spoiled ground beef is accompanied by an unmistakable sour odor. Visual cues for a packaged product include a gaseous, bloated appearance.
 
Cues or no cues, it's always advisable to follow the old adage, “When it doubt, throw it out.”
 
Source(s):
The American Meat Institute "Carbon Monoxide in Meat Packaging: Myths and Facts"

 
 

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