Cast, Not Carved · claim GEO-C533 · Mechanism rung · Materials analyses
Egyptian blue could have originated as a byproduct of natron-on-granite etching: molten natron at ~851 °C on trace-copper-bearing red granite yields a blue compound visually similar to the pigment without separately added copper.
source anchor
Fóti Ch 4, pp ~115–117
Evidence
No evidence records attached yet — this claim is held on its source anchor alone: the ledger knows where the proposition is stated and has admitted no observation behind it. A source is not evidence.
an honest empty state
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