I think the smell test is more for chemical hiding of loss of bluing (cold blue) as it comes off fairly easily.
They have some cold bluing out there that I find darkens metal some, but not incredibly. It leaves little small, but does not match with a luger bluing.
It is usually easy to tell a reblue when compared to non reblue, problem is, many folks have seen few lugers and thus have trouble believing us when we tell them its a reblue...
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