Here are some tips if you want to know how to tell if salsa is bad. If the color, texture, or smell changes, it is time to throw it out. If you notice mold or blue-green patches, or if the salsa has a mushier texture, it’s time to discard it. If it smells weird, it’s probably spoiled. If you can’t stand the sour smell anymore, you should throw it out.
If your salsa looks and smells off, it’s probably gone bad. Check the expiration date on the jar. If it’s too dark, it could be rancid.