Salt Works: on right quality of product is being

Salt Works: on right quality of product is being shown to potential customer while, left, women are refining brine in a boiler. Eggs were sometimes added to brine and the impurities removed from surface with resulting scum. From Johann van Beverwycks Schat der Gesontheyt, Amsterdam, 1660. Copperplate engraving

1660 Added Boiler Brine Chemical Customer Eggs Impurities Potential Refining Removed Resulting Scum Sometimes

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