Early 21st century https://en.m.wikipedia.org/wiki/Fogbank https://twitter.com/JasonKuznicki/status/1481577227124981761 …
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Greek fire and OG Damascus steel come to mind, but not sure if that counts under the rules. The problem is that anything I can think of probably isn’t completely lost. Victorian Age tech seems like a sweet spot for the question.
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it is interesting. from the wikipedia article it sounds like they re-derived a process to make it. did i misread that?
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Yup, and now with explicit knowledge of why the thing they used to do actually worked Sounds like they originally got lucky, with an impurity being important for the final product, without realising the purpose That sort of thing can get lost ofc thru diff suppliers/process
End of conversation
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