Hi guys,
this is my first post so please be gentle 
I wasted almost a month trying to make this peeling effect but the main problem is that I don't know how to make that chipped edges properly so it does not look too uniform and boring
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Tried everything that I could think of and frankly I am spent
I am open for any suggestions
Here is the link for the exercise file https://drive.google.com/open?id=179FUWn5IW6-Sk0HO3jkt8UJKTVNldodO. There are two experiments that I tried in order to get the desired effect. in it there is also a custom made FX-map that is not 100% completed but it allows you to distribute shapes by using a mask with some randomness. Feel free to use it, improve it, whatever
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The another approach was a classic : make the cells using tile random through levels and distance node in order to get a color variation also but the down side is that I cannot control the size of some pieces using a mask. If someone knows how could I do this please tell.
If you do the "classic" approach, you could create a smaller cells generator, and use histogram scan on the large cells to create a mask for the small cells, then blend them together.