Kiwis have the enzyme actinidain. This enzyme will break the peptide bonds from the gelatin. Making gelatin with raw kiwis will not work, because the peptide bonds in the gelatin will be broken down.

But what if you would make plain gelatin, and apply raw kiwis to it? Do the enzymes break down the gelatin when the gelatin already has set?

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    $\begingroup$ It's ok, you did the edit, and now everything is fine.:D One more thing can you link a reference that kiwi truly has that enzyme and it does what you say it does. It's not known to me. $\endgroup$ – Nandor Poka Apr 21 '15 at 19:35
  • $\begingroup$ Do you mean actual kiwis (a family of birds native to New Zealand), or the fruits that are marketed as Kiwifruit? $\endgroup$ – jamesqf Apr 22 '15 at 4:57
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    $\begingroup$ @jamesqf just grab the bird and rub it on the gelatin. $\endgroup$ – user137 Apr 22 '15 at 6:28
  • $\begingroup$ @user137: One would first have to kill & dress it before slicing. $\endgroup$ – jamesqf Apr 22 '15 at 18:06

According to the (non peer reviewed) scientific experiment found here, simply placing a piece of kiwi onto gelatin that has set will cause the gelatin to be hydrolysed by actinidain.

This experiment aims to show the effects of Proteolytic enzymes on proteins and, subsequently, the effects of extreme temperatures on the proteins themselves. Petri dishes filled with gelatin, a derivative of collagen, were acted upon by kiwifruit samples overnight. Some samples were fresh and used as controls; others had been frozen or boiled for two, four, six, eight or ten minutes. The mass of digested gelatin was taken the next day. The results ultimately reflect the effectiveness of the actinidin, the kiwi’s Proteolytic enzyme, under normal conditions and after exposure to extreme temperatures.

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