How Can You Tell If Gruyere Is Bad?
One can tell if Gruyere cheese is bad if it smells sour or has a rancid smell, has mold growing on it, or if it feels slimy or sticky to the touch. Additionally, if the cheese tastes bitter or acidic instead of its usual nutty and sweet flavor, it may not be safe to eat. It’s best to discard the cheese if any of these signs are present.