Monsel's solution is simply ferric sulfate solution. Its styptic action depends upon its content of ferric ion, as ferric ion is a powerful protein precipitant. Ferric chloride is a more convenient source of ferric ions than Monsel's solution, National Formulary; a 3.8 molar solution of ferric chloride can replace Monsel's solution as a styptic for minor surgery.
EPSTEIN E, MAIBACH HI. Monsel's Solution: History, Chemistry, and Efficacy. Arch Dermatol. 1964;90(2):226–228. doi:10.1001/archderm.1964.01600020094022
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