An orange liquid concentrated from the sap of the Muilfāna pine, a species native to cool, temperate coniferous forests with acidic soils. Muilfána reacted with certain enzymes present in mucus, producing a powerful acid which destroyed mucous membrane tissue.Target organs included the eyes, the respiratory system (particularly the windpipe or trachea), the digestive system (particularly the esophagus), the urinary tract, and the genitalia.

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