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Especially when kept in a fridge, since ketchup is shelf stable. In the fridge it should go well past the pull date.

Ketchup is vinegar-based. I don't think it makes much of a difference.

The ketchup doesn't go bad, but the plastic container offgasses directly into the ketchup and also into the air void above the ketchup.

> into the air void above the ketchup.

Somebody at Heinz packaging department should be working on a ketchup syringe.