Does openin a can of tomatoes reduce acidity?

[Gregor111]

All of my research over the last few weeks on San Marzano tomatoes led me to a thread somewhere about getting rid of the acidity.  Does opening a can and letting them sit in the fridge for 24 hours really cure acidity?  I'll try the next time I make sauce but that won't be until this coming weekend.  If this is an urban legend, please let me know.

Greg

[vitus]

Well, opening a bottle of wine to let it "breathe" some oxygen does wonders on some wines.
Sometimes young wines go from harsh to smooth and well aged wines become more complex and rich just by letting them get a little oxygen for some hours.

So I wouldn't be surprised if something similar was true for tomatoes.