Refined Salmiacum Classic Formulas … Natural Herb Library

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Dissolves phlegm and softens hardness ... refined Xi Sha keeps the same old ammonium-chloride medicinal direction as crude Nao Sha but in a cleaner more processed dispensary lane.
Unblocks throat and epigastric obstruction in minute doses ... older formula literature uses it for difficult swallowing, persistent phlegm, and stubborn focal blockage.
Helps disperse nodules and phlegm masses ... this is the same historical softening-hardness logic seen across the ammonium-chloride mineral tradition.
Represents a processed rather than raw mineral identity ... refinement matters because the crude sibling is rougher and more irritating.

Xi Sha San style formulas ... refined salmiacum appears in older obstruction- and phlegm-opening powder traditions.
Modified phlegm and nodule formulas using only minute doses ... selected when a cleaner processed mineral is preferred over crude material.
Specialty external and internal applications preserved in historical formula records ... use that is far narrower than ordinary modern herbal practice.

Historical use distinguishes cleaner refined Xi Sha from rougher crude Nao Sha even though both belong to the same ammonium-chloride medicinal family.
Its place in the tradition depends on penetration, softening, and obstruction-dissolving effects, not on nutritive or tonic value.