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Bananas are dependent on a chemical (ethylene or acetylene) in the air around them to ripen.

If you keep bananas in an acetylene/ethylene-free environment, they stay green.

Green bananas are quite hard and sturdy, which makes transporting them easy and cheap.

When the time comes to sell the bananas, you just need to provide them with acetylene and they will turn yellow and pliable in about 12 hours.



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