I have tried the new technique in this article https://www.researchgate.net/publication/257806135_A_New_Metallographic_Technique_for_Revealing_Grain_Boundaries_in_Aluminum_Alloys to reveal the grain boundaries of FSP treated Al5083 plate and the photo of the result is below. the areas indicated by the arrow become larger and burnt when the etching time is extended. I need support about what these regions are.

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