alfredo_buscatti
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I've been fascinated by the small craters in blasted pipes, and lately I might just have understood from whence they come. They're the tops of birdseye? The birdseye is more porous than the non-grained briar so the blasting hollows out their tops? Grain is harder and is put into relief by the exposure of the non-grained briar? Whereas a pit will be bigger, not circular, like a bit of a fissure?
My apologies for not posting an illustrative picture!
My apologies for not posting an illustrative picture!