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Air is what turns guacamole and fresh avocados brown. After you open a package of guacamole or cut an avocado open, wrap it tightly with plastic wrap. Make sure no air can get in. If it came in a cardboard box as well, put it in there, too. No more unappetizing guacamole!
The picture shows a package of guacamole that was opened more than a day ago. It looks fresh.
When storing guacamole, keep it from turning brown by placing plastic wrap directly on top of the guacamole. Smooth the plastic wrap so there are no air bubbles.
You can make guacamole ahead for use, today or several days later, by pressing plastic wrap directly on the surface. Make sure there are no air bubbles or a way for air to get to the top. Store in refrigerator. Making it ahead saves you time and stress while trying to prepare meals.