Dan Seitz

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The pan sat on a wood-burning furnace. Blood was added, which caused a scum to rise with boiling. The scum drew impurities and was skimmed off with care. The salt maker needed to continually stir the liquid. Shortly before crystallization, beer was added to further draw impurities from the crystals, which were then placed to dry in conical baskets.
Salt: A World History
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