If you've ever wondered if your chocolate has gone bad, there are a few things you can look for. First, check the expiration date on the package. If it's past that date, the chocolate may not be as fresh as it once was. Second, take a look at the chocolate itself. If it's discolored or has white spots on it, that's a sign that it's starting to go bad. Third, smell the chocolate. If it doesn't smell right, or if it smells sour, then it's probably not good to eat anymore. Finally, taste the chocolate. If it tastes off or bitter, throw it out.
So those are a few ways to tell if your chocolate has gone bad. In general, you should err on the side of caution and throw out any chocolate that looks or smells questionable. That way you'll avoid eating something that might make you sick.