Arcanum duplicatum

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Arcanum duplicatum (potassium sulfate), also known as panacea duplicata, in pre-modern medicine, it was used as a diuretic and sudorific.[citation needed]

The recipe was purchased for 500 dollars by the Duke of Holstein.[citation needed] Schroder, the prince's physician, wrote wonders of its great uses in hypochondriacal cases, continued and intermitting fevers, stone, scurvy, etc.[citation needed]