Cast, Not Carved · claim GEO-C566 · Mechanism rung · Recipes and replication experiments
Bottom nubs form when artificial-limestone slurry cast in a fabric-lined mold bulges through a bottom drainage hole as excess water and NaOH drain — predicting nubs for limestone-chemistry casts and none for silicate casts.
source anchor
Fóti Ch 9, pp ~231–245
Evidence
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an honest empty state
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