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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Historical Chinese salt production combined solar evaporation with controlled boiling to concentrate brine and precipitate NaCl crystals.
Origin: Ancient Chinese (Shang dynasty to Qing dynasty) — China
See full technique reference →The process relied on the NaCl solubility curve, with saturation at ~35 % w/w at 30 °C and ~39 % w/w at 100 °C. By evaporating brine in shallow ponds and then boiling at 100 °C, salt makers reduced water content and promoted crystal growth. Ash addition lowered water activity, aiding purification and removing impurities.
Primary Reaction
Evaporation and boiling of brine to precipitate NaCl crystals
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