This method of staining did cross my mind for your chair, it's essentially putting the dark rings left by wet metal on timber all over it, or possibly the other direction of bleaching the hell out of it with oxalic acid. https://youtu.be/BnSgGVnNwVQ
This works best where you have a reasonable amount of tanin(sp?) in the wood. Otherwise it doesn't door much.
You can add tanin using tea or whatever.
@hugo7 started
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This method of staining did cross my mind for your chair, it's essentially putting the dark rings left by wet metal on timber all over it, or possibly the other direction of bleaching the hell out of it with oxalic acid.
https://youtu.be/BnSgGVnNwVQ