The cleanest wootz was at the bottom part of the ingot, the dirtiest with a lot of slag- at the top. The smith partially cut and bent the ingot to use the clean part for the edge and the sides, with the lower quality part of it forming the inner core of the blade. The long “crack” on the spine is the seam of that bending. It is usually filled with brass or silver wire. It is not a forging flaw, it is a hallmark of a wootz blade.
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