The diet that produces a yellow skin is more expensive than the usual diet, but the people at Perdue Farms feel it's worth it because a yellow skin color is one of the fastest ways Frank's inspectors have of finding and disqualifying an inferior bird. If a bird is sick or off its feed, it doesn't absorb nutrients well and won't develop the rich golden color that is characteristic of Perdue birds. Detecting and removing chicken with barked skin is important because damaged skin shortens the shelf life and both dries and toughens the meat. Sometimes when I open a package of chicken, there's a pungent odor that doesn't smell spoiled, but it's definitely unpleasant. If the odor lasts only a matter of seconds, your chicken is probably fine.
Meat is chemically active, and as it ages, it releases sulfur.
When you open a bag that doesn't have air holes, you may notice the accumulated sulfur, but it will quickly disperse into the air. He'll take a deep whiff and find nothing wrong with it. She'll take another sniff and then wonder if it was her imagination. It's just that once the package was opened, the sulfur smell faded into the air like smoke rings. The problem is bacterial spoilage or rancidity or both.