Cast, Not Carved · claim GEO-C565 · Mechanism rung · Ingredients and feasibility
The Sayre & Smith dual-oxide criterion (MgO and K₂O both >2% marks plant-ash glass) permits a glass-composition timeline of natron supply across millennia, and the documented gap in Egyptian glass between Badari and the Old Kingdom is consistent with natron being redirected to large-scale stone production.
source anchor
Fóti Ch 8, pp ~220–223; Sayre & Smith (1961), Science 133(3467):1824–1826
Evidence
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an honest empty state
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