I was baking a pancake and the bottom surface of the pancake varied in color where the bottom of the pan had ridges (spaced by ~1mm)
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at least part of that is delays during batter flow, forming borders
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I really don't know about that halo, maybe the batter "scrunched up" to reveal unbaked parts
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lower left looks more like batter delay but is part of the same formation so I'm a bit confused
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also note the difference in textures in lower left: smooth vs spongy (bubbles had time to float up)
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pancake physics is serious business, there's a kind of pancake notable for hexagonal convection cells

