I had never heard of kidneywood and went down a bit of a Wikipedia rabbit hole… this effect sounds amazing! I don’t know if all kidneywoods can do it, though it’s apparently also found in other Fabaceae plants

https://en.m.wikipedia.org/wiki/Lignum_nephriticum

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I've heard that it has medicinal uses for the kidneys, thus the name, but had not read about it changing the color of water. Interesting.