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I was making apricot jam using fresh apricots and gelling sugar. All went well except I burnt it. Some of the solid parts sank to the bottom and stuck there. After putting the good stuff in jars, I then soaked the pot.

About five hours later I went to scrub it and the whole bottom layer came free in a perfect circle. The under side is shiny — looks like plastic. The upper side is matt and almost furry. As it dries out it is curling up and is brittle.

What happened?

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    $\begingroup$ Classic sol-gel process. The overheating part dehydrated and became somewhat solid. After you soaked it in water afterwards, the soft and hard parts dried (and shrunk) differently, hence the curling up. $\endgroup$
    – Karl
    Jun 24 '19 at 19:05
  • $\begingroup$ You've created a sucrose Frisbee. $\endgroup$ Jun 24 '19 at 22:48