Ah, I see what you mean Kai. I think what you are calling blotches may be deliberate inclusions that are forged into the steel. I don't have an example of that style of blade.
The OP of this thread has a blade that is very "dirty" and hard to read. I'm not entirely convinced that these "blotches" are actually in the blade rather than an artifact on the surface. The blade needs a good polish (and probably an etching) to be sure.
Such inclusions could have some mystical significance. I can't see how they would alter the performance of the weapon much.
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