Dull skin color and/or failure to ripen are both indications of chill injury. Do not store bananas below 55° F/13° C.
Accelerated flesh softening, flesh decay, and poor color indicate storage at high temperatures. Maintain temperature range of 60-65° F/16-18° C.
Black skin with mold around the stem end is an indication of age. Do not hold for long periods of time once fruit becomes soft and ripe.