Cooked some hamburger that was five days past the date on the

Thats oxidation. You'll be fine.

>>9419087
This. Don't be such a squimish priss op. Those are just sell by dates anyways. It's how grocery stores manage inventory more than anything else. If it smells good it is good. If it smells slightly sour just salt it a lil more. If it smells like a rancid baby diaper THROW THAT SHIT OUT.

>>9419087
Yeah, it tasted just fine but I threw most of it out from disgust and paranoia. What a shame.

Normal colored meat

A swift death.

It just means the carbon dioxide they put into it has gone away and as >>9419087 stated, oxygen got to it and it turns normal colored. Some places even use red dyes and other methods to make it look bright red because that is for some reason what people want when they shop for it.