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A comment on Leonardo's wood charring method predates Japanese practice.

Re:Leonardo's wood charring method predates Japanese practice by bell-cot on Wednesday December 31, 2025 @12:46PM (#46446408)
Not an expert - but I'd think that ancient people (at least in non-arid climates) would have noticed that the more-charred part of the wood in an old campfire did not crumble and rot, even over years.
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Re:Leonardo's wood charring method predates Japanese practice by perpil on Wednesday December 31, 2025 @02:02PM (#46447158)
Agreed, maybe a forest fire or lightning strike might have made it more obvious that charring preserved. Charcoal in a campfire could have easily disappeared in the next fire.

They do give Leonardo a lot of credit for a single sentence, but it may be the first documented instance of this charring technique.

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