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Maybe it isn’t the best example—that there’s a recipe disproves my initial point. Roman concrete was very much intended for the use of the “leisured elites” and at that scale they would have to have some sort of replicated and disseminated instruction. Maybe Damascus steel?
Claims about the 'losing' of Damascus steel arise generally from misunderstanding what damascus steel is and confusing different uses of the term. So do you mean Wootz or pattern welding?
I think you just characterized my current (mis)understanding. I threw it out there to keep the discussion going, I think it’s an interesting thread and enjoy hearing from experts.
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