I'd use a paper bag. Plastic bags tend to allow the fruit to go moldy
long before paper.
Supermarkets have ripening rooms and they control how the banana
reaches the selling floor. Maybe Costco does not do it well.
I'm not sure, I was told (or read) to use a paper bag...like a lunch
My guess >>>
closed bag is to increase the concentration of ethylene gas, paper bag
to allow bananas to "breath".
Thus preventing rot by not allowing liquid water (condensation) to
Don't know "why" for sure but in my experience paper bags just work.
1) Paper bag was suggested (I have never attempted to ripen fruit in
a plastic bag...only paper)
2) Perhaps there is truth to "the less than 40F exposure prevents
3) Create additoonal condition
I buy a bag of bananas when my grocery offers the bag O discount. 12-14
bananas for cheap. I guess they are past sell point or something. They are
not bad by any means. I just have to think banana ! Still got a bunch right
now that I bought last Friday, still good.
I see them !!!!
I bought a big paper bag of half price yellow bananas last week, been
eating them, and I think they are still good. I've bought green bananas
that did not last that long.
I now store my bananas away from that heater vent below the counter. I
switched to the cool side of the kitchen.
The problem was that, at Costco, all they had was green, and greener.
In the past, they NEVER ripened - which is why I asked (they 'must'
be ripening for someone or they'd never be able to sell 'em).
Anyway, here are the four bags of bananas, which were bought two
Sunday's ago, so it has been 10 days to date.
Notice only ONE bag ripened.
So, I took the liberty of adding a few more inducements to the
bags (leaving the control alone).
I suspect the control will NEVER ripen, and I'll have to throw
it away - but - I'll let the banana prove me right or wrong on
Well, the funny thing is that, in the past, I've unbagged the green
Costco bananas, and they never ripened. I also left them bagged,
and, they never ripened.
For a long while, I just stopped buying Costco bananas.
But then, I was at Costco on the last Sunday in March, and
I figured I'd buy them, and ASK YOU GUYS.
I do realize the paper bag was the suggested method, along
with the ripened fruits - but I had no paper bags, and not
enough bananas to do all the experiments - so I opted for
the simplest ... which was to put fruits in three of the
So far, I've learned that the yellow Dole banana did almost nothing
to ripen the green DelMonte bananas; and I learned that a single
apple was a risk because it appears to depend on the apple.
So I juggled the apples yesterday - and threw away the yellow
Dole which had turned brown all over - and am currently just
waiting to see if the multiple apples will work.
I will report back in a few days...
imo, your "juggling of the experimental conditions" as time progress
is effectively muddling any results. :(
You might hit a "home run" and discover a ripening solution but at
this point, I cannot say which of your experimental paths I would
repeat to confirm a success.
That over ripe Dole may have been you best ripening agent. Based on
the results so far, I'd give up on Costco bannanas :(
The untouched DelMonte Costco control set of bananas finally ripened!
Today is the 12th of April, and they were bought green
on the 24th of March, which is 19 days elapsed time.
If we selected just the right (magic) apple, that time can be
dropped by two thirds - otherwise - a bunch of random apples
seemed to drop ripening time only by about a third.
The yellow Dole banana was nearly useless as a ripening
agent (which had to be removed when it turned totally brown).
In summary, the green Costco DelMonte bananas, if left alone,
will ripen in two to three weeks but will ripen in one to two
weeks if we put a few apples in the bag.
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