The Power Fruit

Banana peel reveals the stage of ripeness. Bananas are harvested green and at this stage the green peel is firm. As soon as the banana stem is cut from the plant, ripening starts.

• Bananas are harvested green.
• They sweeten as they ripen, as the banana ripens, the peel color lightens and changes to yellow.
• During this process, the starch within the banana converts to sugar giving riper bananas their creamy, sweet taste.

Do not place bananas in your fridge, leave them on the counter is good enough. To hasten the ripening process you can place them in a brown paper bag and close it. The ethylene that's produced by the ripening process actually speeds the ripening process.

Watch the banana peel.

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Check this Banana Color Chart - Suggested Guide For Banana Ripening.

New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35: 193–199 : Preliminary investigation into the uneven ripening of banana (Musa sp.) peel