John Myers
How long can bought mayonnaise be kept after opening if the conditions are met (aseptic removal and the specified temperatures)? The packaging of a well-known manufacturer only says “Best before: See lid” and “Keep refrigerated after opening.”
Mayonnaise can usually be used for two to three weeks after opening. If this contains preservatives it is up to three months.
Mayonnaise in a tube lasts a little longer than from a jar, as the tube offers greater protection against contamination due to its smaller opening. The first centimeter can be easily removed when it has dried.
With a glass you have the advantage that you can see the mayonnaise. If it has already dried up and/or discolored and if it no longer smells or tastes good, then it is better to throw it away.
