A real problem with amateur restoration, even cleaning the red rust with 250 or 400 or 600 grit can smoothen an edge (I mean, an edge of a fuller, the two edges of the back etc...) when it is normally sharp. I have seen a lot of «*cleaned*» things, finally harmed more than cleaned. I would say that the best to clean active rust is to use dear antler and oil. And let the black rust and pitting to professional
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