Forgive the tangential digression but I could not resist responding to the river find keris racket we see at present. It seems that there are folk who try to utilise high school science of anaerobic conditions in the Indonesian rivers they come from added in with historical accounts of battles explaining why these are found on river bottoms in industrial quantities and such wonderful condition! There's a whole industry based around this sham it seems. I'm sure there are real ones out there but most seem fake and that taints the good ones.
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