Fruits produce a hormone called ethylene, which is a gas, which causes fruit to ripen. The faster the fruit ripens, the faster it will also spoil. Wrappings that impede the flow of gas, such as plastic, will have different effects therefore than wrappings which do not impede gas flow, such as paper. Plastic may also be able to interact chemically with the ethylene, which will also affect the rate of ripening.
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