When does geletan undergo a chemical change? How can we tell when a chemical change has occured?

I would like to know when beef geletan, or any type of geletan used in food undergoes a chemical change... Is it common? Is there a way to tell?

Answer:
Normally we look for a color change of some sort to represent a chemical change. Burning is another indicator of a chemical change. Phase changes, solid to liquid and such are examples of physical changes. If you were to accidentally burn the geletan that would be an example of a chemical change. Chemical changes are not easily reveresed, since if you heat up solidified geletan you can easily melt it again, it must only be a physical change.

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