By RIPE, checked against a produce manager's cues. Published .
A closed paper bag at room temperature, with a ripe banana in it. The banana releases ethylene, the bag traps it, and most counter-ripening fruit (avocados, peaches, pears, kiwis, mangoes, plums) will move noticeably in 1 to 3 days.
Good to know
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Paper, not plastic: plastic traps moisture and invites mold.
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It only works on fruit that ripens after picking. A bag will never sweeten a pineapple, a melon, or a strawberry.
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Check daily. Bag-ripening overshoots fast on the last day.
Written by the team behind RIPE, a free app that reads a photo of the whole produce pile and rings the ripest ones. Every cue above is one you can check with your own hands, and it all works with no app at all.
Where this comes from
These cues match the public guidance from university extension services. Read them yourself:
You just read the cue for one piece. RIPE reads a photo of the entire display, draws numbered rings on the ones worth taking, and tells you why in the same plain words these guides use. Then it remembers what you brought home and nudges you before it turns.
It claims only what a camera can actually see. Every verdict ends by handing the last check back to your hands, which is the part these guides just taught you.
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