I don't really know metallurgy, so a stupid question: what if one "on purpose" adds some localized impurity - can it be a seed for the pattern to grow, i.e. the pattern will nicely grow from this point?
Like, for example in the sample above it seems that the pattern "grows" from the sample's surface and is much sparser in the sample's middle; it also nearly absent on the sample's bottom. Could one add something to the sample so it will be an artificial centre of the pattern's growth.
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