While that might have been true in the past and without going into detail most counterfeiters of antique edged weapons now are well beyond using any method that produces red rust unless they are using it as the first process in the creation of an artificial antique finish. Most red rust that you will encounter is usually a result of improper cleaning and handling, poor storage preparation or conditions or a combination of any of these things. I have found that a close inspection of how an item was made and the materials used in its construction can tell you more about its authenticity than depending on the color of any rust that might be present ever could. Quite a few sellers do not and will not clean an item before offering it for sale, but would rather let the new owner decide what if anything should be done.
Best,
Robert
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