Rust on Kuroichi?

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Miyamoto Musashi

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Hi all,

I’ve noticed some brown spots on the Kuroichi finish of my Hisamoto. I don’t believe they were there before. When wiping the spot, there is no brown residue that comes off (which is characteristic of light rust).

Can anyone identify whether this is rust? If not, then what is it? Is it even possible for rust to develop on a Kuroichi?
Thank you all!
 

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