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It's still possible to make seared stone from cobblestone after scavenging your first smeltery:
(1) Smelt seared stone -> 144mB of seared stone
(2) Put cobblestone to the basin and pour 72mB of seared stone on top of it -> 1 seared cobblestone
(3) Smelt seared cobblestone -> 144mB of seared...