Why does jello need boiling and cold water?

 
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1,398 IKU
Posted on Feb. 15th, 2009

These articles provide some information:

http://en.wikipedia.org/wiki/Gelatin_dessert
http://en.wikipedia.org/wiki/Gelatin

I'm not sure I completely understand what's going on, but it seems like the gelatin powder is not soluble in water. The boiling water melts the gelatin, which allows it to mix with water. The articles are not quite so clear on why it must be chilled to refrigerator temperatures in order to "set" (i.e., form a gel.)

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