Salami, like many foods, presents mold over time, but mold isn't always a sign that salami has gone bad. It's actually normal for many varieties of salami to have some mold. However, if the salami smells bad, looks abnormal, feels slimy or tastes unpleasant, just toss it out to be safe. The next time around, keep it in the the refrigerator after opening to prevent it from spoiling.
Smell and Appearance Concerns
Always follow your nose when it comes to sniffing out bad salami. If it smells sour or rancid, or if the odor is unappetizing, your salami is likely bad. Salami should smell fresh and spicy. In addition, a little mold on the exterior -- or ribbons on the inside -- isn't dangerous to eat if they are white or green-blue. Just scrub it off with a scrub brush before eating if it bothers you. Discard any salami that has brown or black fuzz growing on it. These are signs it's bad.
Touch and Taste Issues
Rotten salami may feel slimy, too. Any sticky film is a dead giveaway that your cured meat probably isn't safe to eat. Lastly, trust your palate -- salami should taste meaty and peppery. If you take a bite of salami and immediately want to spit it out because it has a pungent, overly bitter or off-putting flavor, throw it away to be on the safe side.