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More importantly, did you know that bananas go brown for two reasons. One is when they are ripe, the other is that they go brown when they are bruised. If you shine a UV light at a ripe banana, it'll show up the browness in a violet colour. If you shine it at a bruised banana, it won't look any different. The reason for this is that there are some animals that have UV on their visible spectrum, and this allows them to identify which bananas are ripe to eat.
JurekB
@Brun
Why don't bananas go brown on the inside when they split?