OK, my iPad was the problem. Here is an image of the keris, with rust on the ascendant. If I took time-lapse pics, the whole thing would be orangey red in 5 minutes, but a submersion for just a second in the vinegar eliminates the effect. I use spring water for the dilution, but even so that seems like a heck of a lot of iron oxide to have in water, at any rate you would think you could taste that much in a quart of water, and you can't.
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