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I made a dip with basil pesto covering cream cheese with grated parmesan cheese over it all.

Can I keep the dip (tightly covered) for 4 days without the pesto interacting with the cheese?

The pesto was purchased in a jar. It was not opened until yesterday when the dip was made. I only worry about the chemical reaction between the two and rancidity (sp). There was enough left over to use again.


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As long as the whole dip is/was kept in the safe temperature range (under 40 °F / 5 °C), I don't think you will have a food safety issue. Remember, time out of refrigeration (well, technically in the danger zone of 40~140 °F / 5~60 °C) is cumulative. How was the dip served the first time? If the cream cheese (a "potentially hazardous" food, much more so than parmesan or pesto) sat out at room temperature in the danger zone for 2 or more cumulative hours (4 at the outside) you should discard it.

Other than the food safety issue, there may be some minor interaction among the ingredients, but that will be more a palatability issue, not a safety issue. The flavor might even improve.

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Errrm, OP's question was about the flavor interactions. If you could expand on that point in your answer, that'd be great. – derobert Nov 28 '12 at 23:53
@derobert I tried to see your interpretation in the OP question, but I just cannot. Still, I have little to say about the change in flavors other than: if it is safe, just try it. Nothing lost if it isn't still tasty, and if it is, well, enjoy. – SAJ14SAJ Nov 29 '12 at 0:46
The OP says: "I only worry about the chemical reaction between the two and rancidity (sp)." I also take this is mean she's worried about the pesto affecting the flavor of the cream cheese. – Jonathan Christensen Nov 29 '12 at 15:16

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