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How to tell if a kiwi is ripe
Look for an entirely brown skin.
A ripe kiwi will have a fully brown skin, including the fuzz on the surface and the skin underneath. If it is totally green or you can see green under the fuzzy surface, then the kiwi is not yet ripe.
This should not be the only factor that you test on a kiwi to determine if its ripe. It is only a first step to determine if the fruit is anywhere near ripe.