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I read a tip about putting unripe tomatos in a bag with a few bananas in a dark part of the house at room temperature, but I wonder how long - more or less - does it take for the tomatos to be fully ripe and how can one be sure they are good?

Thanks

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How 'unripe' are we talking about here? –  dax Sep 11 '13 at 14:12
    
It should be noted that there is evidence to support the fact that tomatoes that are allowed to ripen on the vine before harvest are more nutritionally rich and contain more antioxidants than tomatoes that are ripened off the vine to a similar ripeness. –  ESultanik Sep 11 '13 at 17:35
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I usually harvest my unripe tomatoes the night before first hard frost. Anything beyond hard green, and into the yellowish/red stage goes in a cardboard box with a ripening apple. That yields me a steady supply of ripe and fairly tasty tomatoes through Thanksgiving and some years up til Christmas. Cover the box with a towel. Some of the tomatoes will go bad, turn soft and squishy, so you need to sort every week or so, and consider drainage in your storage spot, but the majority will eventually ripen. Bananas are ferocious sources of the ripening agent, ethylene, so the time frame with them might be somewhat shorter. Temperature also changes the rate of ripening. Cooler is slower; a fridge is too cold.

Ethylene is heavier than air, so a closed container w a lid is all that's needed to keep it in.

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Thanks. I wanted to know if I put, say, 5 tomatoes in a bag with 5 bananas and leave it over night, would this be too long or not long enough? I just would like to know how to prepare myself for getting my tomatoes ripe enough ahead of a big meal. –  CaseyJones Sep 12 '13 at 14:29
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If they're already close to ripe it could take only a couple of days in your banana bag. –  Wayfaring Stranger Sep 12 '13 at 16:11
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